1. Circannual changes in the testicular activity of the red-vented bulbul Pycnonotus cafer. -;Dasgupta;Pavo,1988
2. Observation on the reproduction of the American alligator (Alligator mississippiensis) in captivity. -;Eriksen;British Herpetological Society Bulletin,1987
3. Photoperiodism and reproductive cycles in birds. -;Farner;Photophysiology,1971
4. Die Steuerung der Fortpflanzungszyklen bei mannlichen Reptilien. -;Fischer;Fortschretteder Zoologie,1974