Gaya APA
Williams, Sid E. (2007).
Positive Thinking (I).
Yogyakarta:
Tugu Publisher.
Gaya Chicago
Williams, Sid E.
Positive Thinking.
I
Yogyakarta:
Tugu Publisher,
2007.
Text.
Gaya MLA
Williams, Sid E.
Positive Thinking.
I
Yogyakarta:
Tugu Publisher,
2007.
Text.
Gaya Turabian
Williams, Sid E.
Positive Thinking.
I
Yogyakarta:
Tugu Publisher,
2007.
Print.