Cita APA (7a ed.)

Rehder, H., & Twaddell, W. F. (1947). The natural setting. Holt.

Cita Chicago Style (17a ed.)

Rehder, Helmut, y W. F. Twaddell. The Natural Setting. New York: Holt, 1947.

Cita MLA (9a ed.)

Rehder, Helmut, y W. F. Twaddell. The Natural Setting. Holt, 1947.