https://www.bto.org/our-work/science/publications/papers/long-term-studies-and-monitoring-bird-populations
Long-term studies and monitoring of bird populations
Long-term studies and monitoring of bird populations
Citation
Greenwood, J.J.D., Baillie, S.R. & Crick, H.Q.P. 1994. Long-term studies and monitoring of bird populations. CAB International, Oxford