Gaya APA

BIRDSALL, S, S., FLORIN, J. (1992). GARIS BESAR GEOGRAFI AMERIKA . USA: Wiley and Sons, Inc.

Gaya MLA

BIRDSALL, STEPHEN, S.., FLORIN, JOHN. "GARIS BESAR GEOGRAFI AMERIKA". USA: Wiley and Sons, Inc, 1992. Text.