The works of Aristotle translated into English. Edited by J.A. Smith and W.D. Ross. 12 vols.

De motu animalium. De incessu animalium. In his Works, edited by J.A. Smith and W.D. Ross, 5, 698a-714b., Oxford, 1912. 

De Anima. In his Works… translated into English. Edited by J. A. Smith and W. D. Ross. 3, 402a-35b., Oxford, 1931.

Aristotle, regarded as the founder of psychology, meant by anima or psyche the living principle which characterizes living substance.