Gaya APA

Birdsall, S, S., Florin, J. (1992). Garis besar:geografi Amerika/ Stephen S.Birdsall Et.All (Cet.4). Amerika Serikat: United States Department Of State.

Gaya MLA

Birdsall, Stephen, S.., Florin, John. "Garis besar:geografi Amerika/ Stephen S.Birdsall Et.All". Cet.4 Amerika Serikat: United States Department Of State, 1992. Text.