Gaya APA

IPS Geografi 1. (1991). Djambtan: GTS.

Gaya Chicago

IPS Geografi 1. . Djambtan: GTS, 1991. Text.

Gaya MLA

IPS Geografi 1. . Djambtan: GTS, 1991. Text.

Gaya Turabian

IPS Geografi 1. Djambtan: GTS, 1991. Print.