Gaya APA
Think Positive. (2011).
Jakarta:
PT Gramedia Pustaka Utama.
Gaya Chicago
Think Positive.
.
Jakarta:
PT Gramedia Pustaka Utama,
2011.
.
Gaya MLA
Think Positive.
.
Jakarta:
PT Gramedia Pustaka Utama,
2011.
.
Gaya Turabian
Think Positive.
Jakarta:
PT Gramedia Pustaka Utama,
2011.
.