Originally published as 'Ethologie, die Biologie des Verhaltens'. Frankfurt-am-Main: Akademische Verlagsgesellschaft Athenaion, 1966.
Ethology : the biology of behavior by Irenäus Eibl-Eibesfeldt. ISBN 0039100812. Published by Holt, Rinehart and Winston in 1970. Publication and catalogue information, links to buy online and reader comments.