Gaya APA

Joesoef, S. ([s.a]). International Relation : hubungan antar bangsa . Medan: Firma \" Rimbow\" Medan.

Gaya MLA

Joesoef, Sou'yb. "International Relation : hubungan antar bangsa". Medan: Firma \" Rimbow\" Medan, [s.a]. Text.