Gaya APA

Alexander, D, C., Koeberlein, G, M. (2007). Elementary geometry for college students (Ed. 4). Boston: Houghton Mifflin Company.

Gaya MLA

Alexander, Daniel, C., Koeberlein, Geralyn, M. "Elementary geometry for college students". Ed. 4 Boston: Houghton Mifflin Company, 2007. Text.