Cita APA (7th ed.)

Gleason, H. A., & Cronquist, A. (1964). The natural geography of plants. Columbia University Press.

Cita Chicago (17th ed.)

Gleason, Henry Allan, i Arthur Cronquist. The Natural Geography of Plants. New York: Columbia University Press, 1964.

Cita MLA (9th ed.)

Gleason, Henry Allan, i Arthur Cronquist. The Natural Geography of Plants. Columbia University Press, 1964.