TY  - BOOK
AU  - Keller,Fred S.
AU  - Schoenfeld,William N.
TI  - Principles of psychology : : a systematic text in the science of behavior / 
T2  - The Century Psychology Series
U1  - 150. 
PY  - 1950///
CY  - New York : 
PB  - Appleton-Century-Crofts, 
KW  -  Psicología
KW  - prendizaje
KW  - Motivación
ER  -