Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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