Citation
Sparks, T.H., Collinson, N., Crick, H.Q.P., Croxton, P., Edwards, M., Huber, K., Jenkins, D., Johns, D., Last, F., Maberly, S., Marquiss, M., Pickup, J., Roy, D., Sims, D., Shaw, D., Turner, A., Watson, A., Woiwod, I. & Woodbridge, K. 2006. Natural Heritage Trends of Scotland: phenological indicators of climate change. Scottish Natural Heritage Commissioned Report No. 167. SNH, Inverness