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Gaya APA
Gravity. (2016).
Jakarta:
PT Gramedia Pustaka Utama.
Gaya Chicago
Gravity.
.
Jakarta:
PT Gramedia Pustaka Utama,
2016.
Text.
Gaya MLA
Gravity.
.
Jakarta:
PT Gramedia Pustaka Utama,
2016.
Text.
Gaya Turabian
Gravity.
Jakarta:
PT Gramedia Pustaka Utama,
2016.
Print.