Gaya APA
Beck, C. Robert. (1990).
Motivation Theories and Principles (edisi 1).
America:
Publicher.
Gaya Chicago
Beck, C. Robert.
Motivation Theories and Principles.
edisi 1
America:
Publicher,
1990.
Text.
Gaya MLA
Beck, C. Robert.
Motivation Theories and Principles.
edisi 1
America:
Publicher,
1990.
Text.
Gaya Turabian
Beck, C. Robert.
Motivation Theories and Principles.
edisi 1
America:
Publicher,
1990.
Print.