Dyfyniad APA
Thoreau, H. D., & Polley, R. L. (1966). America the beautiful in the words of Henry David Thoreau ([1st ed.].). Country Beautiful Foundation.
Dyfyniad Arddull Chicago
Thoreau, Henry David, and Robert L. Polley. America the Beautiful in the Words of Henry David Thoreau. [1st ed.]. Waukesha, Wis.: Country Beautiful Foundation, 1966.
Dyfyniad MLA
Thoreau, Henry David, and Robert L. Polley. America the Beautiful in the Words of Henry David Thoreau. [1st ed.]. Country Beautiful Foundation, 1966.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.