APA-ийн эшлэл(7 дахь хэвлэлт)

Birdsall, S. S., & Florin, J. (1992). Outline of american geography: Regional landscapes of the united states (Fourth edition.). John Wiley.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Birdsall, Stephen S., ба John Florin. Outline of American Geography: Regional Landscapes of the United States. Fourth edition. New York: John Wiley, 1992.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Birdsall, Stephen S., ба John Florin. Outline of American Geography: Regional Landscapes of the United States. Fourth edition. John Wiley, 1992.