Roy, H.E., Scalera, R., Dunn, A. & Hesketh, H. (2016) Invasive species: Control wildlife pathogens too. Nature, 530, 281-281.

Pell, J.K., Baverstock, J., Roy, H.E., Ware, R.L. & Majerus, M.E.N. (2007) Intraguild predation involving Harmonia axyridis: a review of current knowledge and future perspectives. BioControl, 53, 147-168.

Roy, H.E., Brown, P.M.J., Rothery, P., Ware, R.L. & Majerus, M.E.N. (2007) Interactions between the fungal pathogen Beauveria bassiana and three species of coccinellid: Harmonia axyridis, Coccinella septempunctata and Adalia bipunctata. BioControl, 53, 265-276.

Katsanevakis, S., Genovesi, P., Gaiji, S., Hvid, H.N., Roy, H.E., Nunes, A.L., Aguado, F.S., Bogucarskis, K., Dubusscher, B., Deriu, I., Harrower, C.A., Josefsson, M., Lucy, F.E., Marchini, A., Richards, G., Trichkova, T., Vanderhoeven, S., Zentos, A. & Cardoso, A.C. (2013) Implementing the European policies for alien species – networking, science, and partnership in a complex environment. Management of Biological Invasions, 4, 3-6.

Parrott, D., Roy, S., Baker, R., Cannon, R., Eyre, D., Hill, M.O., Wagner, M., Preston, C.D., Roy, H.E., Beckmann, B., Copp, G.H., Ellis, J., Laing, I., Britton, J.R., Gozlan, R.E. & Mumford, J. (2009) Horizon Scanning For New Invasive Non-Native Species In England. Report To Natural England (Natural England Contract No. Sae03-02-189). Central Science Laboratory, York.

Parrott, D., Roy, S., Baker, R., Cannon, R., Eyre, D., Hill, M.O., Wagner, M., Preston, C.D., Roy, H.E. & Beckmann, B. (2009) Horizon scanning for new invasive non-native animal species in England.

Roy, H.E., Peyton, J., Aldridge, D.C., Bantock, T., Blackburn, T.M., Britton, R., Clark, P., Cook, E., Dehnen-Schmutz, K., Dines, T., Dobson, M., Edwards, F., Harrower, C.A., Harvey, M.C., Minchin, D., Noble, D.G., Parrott, D., Pocock, M.J.O., Preston, C.D., Roy, S., Salisbury, A., Schönrogge, K., Sewell, J., Shaw, R.H., Stebbing, P., Stewart, A.J.A. & Walker, K.J. (2014) Horizon scanning for invasive alien species with the potential to threaten biodiversity in Great Britain. Global Change Biology, 20, 3859-3871.

Roy, H.E. & Roy, D.B. (2008) Harmonia Axyridis. In: Handbook Of Alien Species In Europe. (Ed.: Daisie). Springer series in Invasion Ecology.

Brown, P.M.J., Roy, H.E., Rothery, P., Roy, D.B., Ware, R.L. & Majerus, M.E.N. (2008) Harmonia axyridis in Great Britain: analysis of the spread and distribution of a non-native coccinellid. From Biological Control to Invasion: the Ladybird Harmonia axyridis as a Model Species From Biological Control to Invasion: the Ladybird Harmonia axyridis as a Model Species. (eds H.E. Roy), & Wajnberg, E.), pp. 55-67. Springer Netherlands.

Brown, P.M.J., Roy, H.E., Rothery, P., Roy, D.B., Ware, R.L. & Majerus, M.E.N. (2008) Harmonia axyridis in Great Britain: analysis of the spread and distribution of a non-native coccinellid. From Biological Control to Invasion: the Ladybird Harmonia axyridis as a Model Species From Biological Control to Invasion: the Ladybird Harmonia axyridis as a Model Species. (eds H.E. Roy), & Wajnberg, E.), pp. 55-67. Springer Netherlands.

Brown, P.M.J., Roy, H.E., Rothery, P., Roy, D.B., Ware, R.L. & Majerus, M.E.N. (2007) Harmonia axyridis in Great Britain: analysis of the spread and distribution of a non-native coccinellid. BioControl, 53, 55-67.

Brown, P.M.J., Adriaens, T., Bathon, H., Cuppen, J., Goldarazena, A., Hägg, T., Kenis, M., Klausnitzer, B.E.M., Kovář, I., Loomans, A.J.M., Majerus, M.E.N., Nedved, O., Pedersen, J., Rabitsch, W., Roy, H.E., Ternois, V., Zakharov, I.A. & Roy, D.B. (2008) Harmonia axyridis in Europe: spread and distribution of a non-native coccinellid. BioControl, 53, 5-21.

Roy, H.E., Brown, P.M.J., Ware, R.L., Michie, L.J., Beckmann, B. & Majerus, M.E.N. (2008) The harlequin ladybird marches on. British Wildlife, 19, 182-186.

Holroyd, O., Brown, P.M.J., Roy, H.E. & Majerus, M.E.N. (2008) The harlequin ladybird, Harmonia axyridis, reaches Scotland. Entomologists’ Record and Journal of Variation, 120, 42-43.

Murchie, A.K., Moore, J.P., Moore, G.A. & Roy, H.E. (2008) The harlequin ladybird, Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae), found in Ireland. Irish Naturalists' Journal,, 29, 25-26.

Roy, H.E., Brown, P.M.J., Adriaens, T., Berkvens, N., Borges, I., Clusella-Trullas, S., Comont, R.F., De Clercq, P., Eschen, R., Estoup, A., Evans, E.W., Facon, B., Gardiner, M.M., Gil, A., Grez, A.A., Guillemaud, T., Haelewaters, D., Herz, A., Honek, A., Howe, A.G., Hui, C., Hutchison, W.D., Kenis, M., Koch, R.L., Kulfan, J., Handley, L.L., Lombaert, E., Loomans, A., Losey, J., Lukashuk, A.O., Maes, D., Magro, A., Murray, K.M., San Martin, G., Martinkova, Z., Minnaar, I.A., Nedved, O., Orlova-Bienkowskaja, M.J., Osawa, N., Rabitsch, W., Ravn, H.P., Rondoni, G., Rorke, S.L., Ryndevich, S.K., Saethre, M.G., Sloggett, J.J., Soares, A.O., Stals, R., Tinsley, M.C., Vandereycken, A., van Wielink, P., Viglasova, S., Zach, P., Zakharov, I.A., Zaviezo, T. & Zhao, Z.H. (2016) The harlequin ladybird, Harmonia axyridis: global perspectives on invasion history and ecology. Biological Invasions, 18, 997-1044.

Tweddle, J.C., Robinson, L.D., Pocock, M.J.O. & Roy, H.E. (2012) Guide To Citizen Science: Developing, Implementing And Evaluating Citizen Science To Study Biodiversity And The Environment In The Uk. NERC/Centre for Ecology & Hydrology, Wallingford.

Hill, M.O., Bacon, J., Beckmann, B., Bishop, J.D.D., Marchant, J.H., Musgrove, A.J., Rathod, B., Roy, H.E. & Sewell, J. (2010) Gb Non-Native Species Information Portal: Interim Report For The Period February 2009 To March 2010. Defra.

Roy, H.E., Preston, C.D., Harrower, C.A., Rorke, S.L., Noble, D.G., Sewell, J., Walker, K.J., Marchant, J.H., Seeley, B., Bishop, J., Jukes, A.R., Musgrove, A.J., Pearman, D.A. & Booy, O. (2014) GB Non-native Species Information Portal: documenting the arrival of non-native species in Britain. Biological Invasions, 16, 2495-2505.

Roy, H.E. & Wajnberg, E. (2008) From biological control to invasion: the ladybird Harmonia axyridis as a model species. From Biological Control to Invasion: the Ladybird Harmonia axyridis as a Model Species From Biological Control to Invasion: the Ladybird Harmonia axyridis as a Model Species. (eds H.E. Roy), & Wajnberg, E.), pp. 1-4. Springer Netherlands, Dordrecht.

Roy, H.E. & Wajnberg, E. (2008) From biological control to invasion: the ladybird Harmonia axyridis as a model species. From Biological Control to Invasion: the Ladybird Harmonia axyridis as a Model Species From Biological Control to Invasion: the Ladybird Harmonia axyridis as a Model Species. (eds H.E. Roy), & Wajnberg, E.), pp. 1-4. Springer Netherlands, Dordrecht.

Roy, H.E., Baxter, E., Saunders, A. & Pocock, M.J.O. (2016) Focal Plant Observations as a Standardised Method for Pollinator Monitoring: Opportunities and Limitations for Mass Participation Citizen Science. Plos One, 11.

Roy, H.E. (2010) Encounters with aliens Invasive species - they're here!. Catalyst, 20, 20-22.

Pocock, M.J.O., Newson, S.E., Henderson, I.G., Peyton, J., Sutherland, W.J., Noble, D.G., Ball, S.G., Beckmann, B., Biggs, J., Brereton, T.M., Bullock, D.J., Buckland, S.T., Edwards, M., Eaton, M.A., Harvey, M.C., Hill, M.O., Horlock, M., Hubble, D.S., Julian, A.M., Mackey, E.C., Mann, D.J., Marshall, M.J., Medlock, J.M., O'Mahony, E.M., Pacheco, M., Porter, K., Prentice, S., Procter, D.A., Roy, H.E., Southway, S.E., Shortall, C.R., Stewart, A.J.A., Wembridge, D.E., Wright, M.A. & Roy, D.B. (2015) Developing and enhancing biodiversity monitoring programmes: a collaborative assessment of priorities. Journal of Applied Ecology, 52, 686–695.

Hill, M.O., Beckmann, B., Bishop, J.D.D., Fletcher, M.R., Lear, D.B., Marchant, J.H., Maskell, L.C., Noble, D.G., Rehfisch, M.M., Roy, H.E., Roy, S. & Sewell, J. (2009) Developing An Indicator Of The Abundance, Extent And Impact Of Invasive Non-Native Species. Final Report. Defra.