1. Standard methods for the examination of water, sewage and industrial wastes;American Public Health Association,1956
2. Pellet regurgitation by captive sparrow hawks;Balgooyen;Condor,1971
3. Behavior and ecology of the American kestrel (Falco sparverius) in the Sierra Nevada of California;Balgooyen,1976
4. The gaseous metabolism of large wild birds under aviary life;Benedict,1927