Gaya APA
Beck, R, C.
(2004).
MOTIVATION: Theories and principles
(
5th Ed.)
.
Upper Saddle River, NJ:
Wiley.
Gaya MLA
Beck, Robert, C.
"MOTIVATION: Theories and principles".
5th Ed.
Upper Saddle River, NJ:
Wiley,
2004.
Text.