Cita APA (7a ed.)

Cohen, S. B. (1968). Geography and the American environment. Voice of America.

Cita Chicago Style (17a ed.)

Cohen, Saul B. Geography and the American Environment. [S.l.]: Voice of America, 1968.

Cita MLA (9a ed.)

Cohen, Saul B. Geography and the American Environment. Voice of America, 1968.