1. Heron—Public enemy number 1;Anon;Fish Farmer,1980
2. Sampling survey: Principles and methods;Barnett,1991
3. Design and analysis methods for fish survival methods based on release-recapture;Burnham;Amer. Fish. Soc. Monogr.,1987
4. Silent death, the destruction of birds and mammals through the deliberate misuse of poisons in Britain;Cadbury,1980
5. Grey herons at trout farms in England and Wales;Cadbury,1984