APA Style
Umar, Fitrawan, Djamari, Hartono, Natalia. ().
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Chicago Style
Umar, Fitrawan, Djamari, Hartono, Natalia.
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MLA Style
Umar, Fitrawan, Djamari, Hartono, Natalia.
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Turabian Style
Umar, Fitrawan, Djamari, Hartono, Natalia.
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