Cita APA (7a ed.)

Hitch, A. S., & Sorenson, M. (1964). Conservation and you. Van Nostrand.

Cita Chicago Style (17a ed.)

Hitch, Allen S., y Marian Sorenson. Conservation and You. Princeton, N. J.: Van Nostrand, 1964.

Cita MLA (9a ed.)

Hitch, Allen S., y Marian Sorenson. Conservation and You. Van Nostrand, 1964.