Roy, H.E., Bacon, J., Beckmann, B., Harrower, C.A., Hill, M.O., Isaac, N.J.B., Preston, C.D., Rathod, B., Rorke, S.L., Marchant, J.H., Musgrove, A.J., Noble, D.G., Sewell, J., Seeley, B., Sweet, N., Adams, L., Bishop, J., Jukes, A.R., Walker, K.J. & Pearman, D.A. (2012) Non-Native Species in Great Britain: Establishment, Detection and Reporting to Inform Effective Decision-Making. Defra.
