TY  - BOOK
AU  - Beck,Robert C.
TI  - Motivation: theories and principles 
SN  - 0136030777
PY  - 1990///
CY  - Englewood Cliffs, N. J.
PB  - Prentice-Hall
KW  - Motivation (Psychology)
N1  - Includes bibliographical references (p. 362-398) and index
ER  -