Gaya APA

Birdsall, S, S., Florin,John, . (1992). Garis besar geografi Amerika (Ed. 4). America: John Willey & Son.

Gaya MLA

Birdsall, Stephen, S.., Florin,John, . "Garis besar geografi Amerika". Ed. 4 America: John Willey & Son, 1992. Text.