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Gaya APA

Purba, A, Z, U. (2005). Hak Kekayaan Intelektual Pasca Trips . Bandung: Alumni.

Gaya MLA

Purba, Achmad, Zen, Umar. "Hak Kekayaan Intelektual Pasca Trips". Bandung: Alumni, 2005. Text.