Cita APA (7a ed.)

Thoreau, H. D., & Polley, R. L. (1966). America the beautiful in the words of Henry David Thoreau ([1st ed.].). Country Beautiful Foundation.

Cita Chicago Style (17a ed.)

Thoreau, Henry David, y Robert L. Polley. America the Beautiful in the Words of Henry David Thoreau. [1st ed.]. Waukesha, Wis.: Country Beautiful Foundation, 1966.

Cita MLA (9a ed.)

Thoreau, Henry David, y Robert L. Polley. America the Beautiful in the Words of Henry David Thoreau. [1st ed.]. Country Beautiful Foundation, 1966.