APA (7e ed.) Bronvermelding

Não informado. (2020). Records. Geological Survey Department.

Chicago (17e ed.) Bronvermelding

Não informado. Records. Georgetown: Geological Survey Department, 2020.

MLA (8e ed.) Bronvermelding

Não informado. Records. Geological Survey Department, 2020.

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