Cita APA (7th ed.)

Cohen, S. B. (1967). Geography and the American environment. s.n.

Cita Chicago (17th ed.)

Cohen, Saul B. Geography and the American Environment. Washington, D.C: s.n, 1967.

Cita MLA (9th ed.)

Cohen, Saul B. Geography and the American Environment. s.n, 1967.