APA (7e ed.) Bronvermelding

Não informado. (1954). Virginia minerals. Department of Conservation and Development, Division of Geology.

Chicago (17e ed.) Bronvermelding

Não informado. Virginia Minerals. Charlottesville, Va: Department of Conservation and Development, Division of Geology, 1954.

MLA (8e ed.) Bronvermelding

Não informado. Virginia Minerals. Department of Conservation and Development, Division of Geology, 1954.

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