Gaya APA
Positive Thinking vs Positive Attitude. (2011).
Yogyakarta:
Loscus.
Gaya Chicago
Positive Thinking vs Positive Attitude.
.
Yogyakarta:
Loscus,
2011.
Text.
Gaya MLA
Positive Thinking vs Positive Attitude.
.
Yogyakarta:
Loscus,
2011.
Text.
Gaya Turabian
Positive Thinking vs Positive Attitude.
Yogyakarta:
Loscus,
2011.
Print.