TY  - BOOK
AU  - Koffka, K
AU  - Koffka,K
TI  - Principles of Gestalt Psychology
U1  - O64.4 
PY  - 1940///
CY  - London
PB  - Kegan Paul, Trench, Trubner & Co.Ltd
N1  - includes index and biblioraphy
ER  -