APA (7th ed.) Zitazioa

Muir, J. (1981). Our national parks. University of Wisconsin Press.

Chicago Style (17th ed.) Zitazioa

Muir, John. Our National Parks. Madison, Wis.: University of Wisconsin Press, 1981.

MLA (9th ed.) Zitazioa

Muir, John. Our National Parks. University of Wisconsin Press, 1981.