APA (7th ed.) Zitazioa

Anderson, W. I. (1998). Iowa's geological past: Three billion years of earth history. University of Iowa Press.

Chicago Style (17th ed.) Zitazioa

Anderson, Wayne I. Iowa's Geological Past: Three Billion Years of Earth History. Iowa City: University of Iowa Press, 1998.

MLA (9th ed.) Zitazioa

Anderson, Wayne I. Iowa's Geological Past: Three Billion Years of Earth History. University of Iowa Press, 1998.