1. Observational study of behavior: sampling methods;Altmann;Behaviour,1974
2. Life Histories of North American Birds of Prey, Part I;Bent,1961
3. Life Histories of North American Marsh Birds;Bent,1963
4. Natural history of the black-bellied tree duck (Dendrocygna autumnalis) in southern Texas;Bolen;Southwest. Nat.,1964
5. The Ecology of the Black-bellied Tree Duck in Southern Texas;Bolen,1967