By Lorenz, Konrad.
Barcelona Plaza and Janes 1976 .
414 p. ill. , Translation of Uber Tiersches und Menschliches Verhalten.

México Siglo Veintiuno 1970 .
416 p. , Translation of : Sex and behavior

By Goldberg, Jacques..
Bilbao Ediciones Mensajero 1977 .
249 p. : ill. , Translation of : L'animal et l'homme.

By Ricketts, Edward F..
Stanford, Calif. Stanford University Press 1956 .
xiii, 502 p.

By Carthy, John D..
[Barcelona] Salvat 1967 .
155 p.