TY  - BOOK
AU  - Petri,Herbert L.
TI  - Motivation: theory and research 
SN  - 0534009360
PY  - 1981///
CY  - Belmont, Ca.
PB  - Wadsworth Publishing Co.
KW  - Motivation (Psychology)
N1  - Includes bibliographical references (p. 321-361) and index
ER  -