TY  - BOOK
AU  - Beck,Robert C.
TI  - Motivation: theories and principles 
SN  - 0136039022
PY  - 1978///
CY  - Englewood Cliffs, N. J.
PB  - Prentice-Hall
KW  - Motivation (Psychology)
N1  - Includes bibliographical references (p. 419-459) and index
ER  -