TY  - BOOK
AU  - Bierens de Haan,J.A.
TI  - Animal psychology: its nature and its problems 
U1  - 151.3 
PY  - 1947///
CY  - London
PB  - Hutchinson's University Library
KW  - Animal intelligence
KW  - Psychology, Comparative
N1  - Bibliography: p.155-156
ER  -