Gaya APA

Birddsall, S, S. et al (1992). GARIS BESAR GEOGRAFI AMERIKA (Ed.4). US Amerika: United States : united states department of state.,.

Gaya MLA

Birddsall, Stephen, S.. et al. "GARIS BESAR GEOGRAFI AMERIKA". Ed.4 US Amerika: United States : united states department of state.,, 1992. Text.