1. The placenta and generative apparatus of the elephant;Chapman;J. Acad. Natl. Sci. Philadelphia,1881
2. Breeding Indian elephants, Elephas maximus, at Hanover Zoo;Dittrich;Int. Zoo Yearb.,1966
3. The behaviour of swine;Hafez,1969
4. The behaviour of sheep and goats;Hafez,1969
5. “Motty” — birth of an African/Asian elephant at Chester Zoo;Howard;Elephant,1979