Pocock, M.J.O., Chapman, D.S., Sheppard, L.J. & Roy, H.E. (2014) Choosing And Using Citizen Science: A Guide To When And How To Use Citizen Science To Monitor Biodiversity And The Environment. NERC/Centre for Ecology & Hydrology, Wallingford.

Roy, H.E. (2010) Coccinellids In A Changing World. In: Ecology Of Aphidophaga (Eds.: P. Kindlmann). Springer Academic Publishers, Netherlands.

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.

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

Roy, H.E., Brown, P.M.J., Frost, R. & Poland, R. (2011) Ladybirds (Coccinellidae) Of Britain And Ireland. Field Studies Council, Shrewsbury.

Ceryngier, P., Roy, H.E. & Ware, R.L. (2012) Natural Enemies Of Ladybird Beetles. In Ecology Of The Coccinellidae. Hodek, I., Honěk, A. And Van Emden, H. Kluwer Academic Publishers.

Edwards, R. & Roy, H.E. (2009) Provisional Atlas Of The Aculeate Hymenoptera Of The British Isles, Part 7. Centre for Ecology and Hydrology, Wallingford.

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.

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.

Burns, F., Eaton, M.A., Barlow, K.E., Beckmann, B., Brereton, T.M., Brooks, D.R., Brown, P.M.J., N. Fulaij, A., Gent, T., Henderson, I.G., Noble, D.G., Parsons, M.S., Powney, G.D., Roy, H.E., Stroh, P., Walker, K.J., Wilkinson, J.W., Wotton, S.R. & Gregory, R.D. (2016) Agricultural management and climatic change are the major drivers of biodiversity change in the UK. PLoS ONE, 11, e0151595.

Roy, H.E., Hesketh, H., Purse, B.V., Eilenberg, J., Santini, A., Scalera, R., Stentiford, G.D., Adriaens, T., Bacela-Spychalska, K., Bass, D., Beckmann, K.M., Bessell, P., Bojko, J., Booy, O., Cardoso, A.Cristina, Essl, F., Groom, Q., Harrower, C.A., Kleespies, R., Martinou, A.F., van Oers, M.M., Peeler, E.J., Pergl, J., Rabitsch, W., Roques, A., Schaffner, F., Schindler, S., Schmidt, B.R., Schönrogge, K., Smith, J., Solarz, W., Stewart, A.J.A., Stroo, A., Tricarico, E., Turvey, K.M.A., Vannini, A., Vilà, M., Woodward, S., Wynns, A.Amtoft & Dunn, A.M. (2016) Alien Pathogens on the Horizon: Opportunities for Predicting their Threat to Wildlife. Conservation Letters, n/a-n/a.

Roy, H.E., Hails, R.S., Hesketh, H., Roy, D.B. & Pell, J.K. (2009) Beyond biological control: non-pest insects and their pathogens in a changing world. Insect Conservation and Diversity, 2, 65-72.

Comont, R.F., McCracken, M.E., Hesketh, H., Hails, R.S. & Roy, H.E. (2009) Bivoltine Blues: A second generation in the British Chalkhill Blue Polyommatus coridon (Lepidoptera: Lycaenidae). British Journal of Entomology and Natural History, 22.

Garnas, J.R., Auger-Rozenberg, M.A., Roques, A., Bertelsmeier, C., Wingfield, M.J., Saccaggi, D.L., Roy, H.E. & Slippers, B. (2016) Complex patterns of global spread in invasive insects: eco-evolutionary and management consequences. Biological Invasions, 18, 935-952.

Roy, H.E., Rorke, S.L., Beckmann, B., Booy, O., Botham, M.S., Brown, P.M.J., Harrower, C.A., Noble, D.G., Sewell, J. & Walker, K.J. (2015) The contribution of volunteer recorders to our understanding of biological invasions. Biological Journal of the Linnean Society, 115, 678–689.

Essl, F., Bacher, S., Blackburn, T.M., Booy, O., Brundu, G., Brunel, S., Cardoso, A.C., Eschen, R., Gallardo, B., Galil, B., García-Berthou, E., Genovesi, P., Groom, Q., Harrower, C.A., Hulme, P.E., Katsanevakis, S., Kenis, M., Kühn, I., Kumschick, S., Martinou, A.F., Nentwig, W., O'Flynn, C., Pagad, S., Pergl, J., Pyšek, P., Rabitsch, W., Richardson, D.M., Roques, A., Roy, H.E., Scalera, R., Schindler, S., Seebens, H., Vanderhoeven, S., Vilà, M., Wilson, J., Zentos, A. & Jeschke, J.M. (2015) Crossing Frontiers in Tackling Pathways of Biological Invasions. BioScience, 65, 769-782.

Kenis, M., Roy, H.E., Zindel, R. & Majerus, M.E.N. (2007) Current and potential management strategies against Harmonia axyridis. BioControl, 53, 235-252.

Kenis, M., Roy, H.E., Zindel, R. & Majerus, M.E.N. (2008) Current and potential management strategies against Harmonia axyridis. BioControl, 53, 235-252.

Gardiner, M., Losey, J., Smyth, R., Allee, L., Roy, H.E. & Brown, P.M.J. (2012) Data Accuracy and Citizen Science: Lessons Learned from Studying Lady Beetles in the US and UK. Frontiers in Ecology and the Environment, 10, 471- 476.

Hui, C., Richardson, D.M., Landi, P., Minoarivelo, H.O., Garnas, J. & Roy, H.E. (2016) Defining invasiveness and invasibility in ecological networks. Biological Invasions, 18, 971-983.

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.

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

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.