Gaya APA

Gembirasari, ., Birdsall, S, S. (1992). Garis Besar Geografi Amerika (Ed.4). Amerika Serikat: United States Department of State.

Gaya MLA

Gembirasari, ., Birdsall, Stephen, S.. "Garis Besar Geografi Amerika". Ed.4 Amerika Serikat: United States Department of State, 1992. Text.