APA-ийн эшлэл(7 дахь хэвлэлт)

Birdsall, S. S. (1992). Outline of American geography: Regional landscapes of the united States (4th ed.). John Willey.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Birdsall, Stephen S. Outline of American Geography: Regional Landscapes of the United States. 4th ed. California: John Willey, 1992.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Birdsall, Stephen S. Outline of American Geography: Regional Landscapes of the United States. 4th ed. John Willey, 1992.