APA-referens (7:e uppl.)

(1973). Geologic sections, Jackson Purchase region, Kentucky, and adjacent areas. Washington, D C : Department of the Interior.

Chicago-referens (17:e uppl.)

Geologic Sections, Jackson Purchase Region, Kentucky, and Adjacent Areas. Washington, D C : Department of the Interior, 1973.

MLA-referens (9:e uppl.)

Geologic Sections, Jackson Purchase Region, Kentucky, and Adjacent Areas. Washington, D C : Department of the Interior, 1973.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.