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Roy, D.B., Brereton, T.M., Cruickshanks, K.L., J. Greatorex-Davies, N., Middlebrook, I., Rothery, P. & Warren, M.S. (2008) Developing A Uk-Wide Butterfly Monitoring Scheme: Integrating The Wider Countryside. Centre for Ecology and Hydrology and Butterfly Conservation.

Botham, M.S., Rothery, P., Hulme, P.E., Hill, M.O., Preston, C.D. & Roy, D.B. (2009) Do urban areas act as foci for the spread of alien plant species? An assessment of temporal trends in the UK. Diversity and Distributions, 15, 338-345.