APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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

Let op: Deze citaties zijn niet altijd 100% accuraat.