Gaya APA
Petri, Herbert L.. (1981).
Motivation : Theory and Research .
California:
Wadsworth Publishing Company.
Gaya Chicago
Petri, Herbert L..
Motivation : Theory and Research.
California:
Wadsworth Publishing Company,
1981.
Text.
Gaya MLA
Petri, Herbert L..
Motivation : Theory and Research.
California:
Wadsworth Publishing Company,
1981.
Text.
Gaya Turabian
Petri, Herbert L..
Motivation : Theory and Research.
California:
Wadsworth Publishing Company,
1981.
Print.