TY  - BOOK
AU  - Bierens,J.A.
TI  - Animal psychology, its nature and its problems
U1  - 151.3 
PY  - 1949///
CY  - New York
PB  - Hutchinson's University Library
KW  - Psychology, Comparative
KW  - Animal intelligence
N1  - Includes bibliographical references and index
ER  -