Gaya APA

Ass.(IPA), I, P. (1991). Indonesia oil and gas fields atlas volume II : Central Sumatra. (1991). : Jakarta : Indonesian Petroleum Association,.

Gaya MLA

Ass.(IPA), Indonesian, Petroleum. "Indonesia oil and gas fields atlas volume II : Central Sumatra.". 1991 : Jakarta : Indonesian Petroleum Association,, 1991. Text.