APA (7e ed.) Bronvermelding

Civilian Conservation Corps (U.S.). Company 1640. Twin Hill billy. Company 1640.

Chicago (17e ed.) Bronvermelding

Civilian Conservation Corps (U.S.). Company 1640. Twin Hill Billy. Port Angeles, Wash.: Company 1640.

MLA (8e ed.) Bronvermelding

Civilian Conservation Corps (U.S.). Company 1640. Twin Hill Billy. Company 1640.

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