Cita APA (7a ed.)

Voices of America (Radio Program) & Cohen, S. B. (1967). Geography and the American environment. s.n.

Cita Chicago Style (17a ed.)

Voices of America (Radio Program) y Saul B. Cohen. Geography and the American Environment. Washington, D.C: s.n, 1967.

Cita MLA (9a ed.)

Voices of America (Radio Program) y Saul B. Cohen. Geography and the American Environment. s.n, 1967.