Sylvia S Mader. (1989). Biology. Dubuque, Iowa: WCB.
Chicago Style aipamenaSylvia S Mader. Biology. Dubuque, Iowa: WCB, 1989.
MLA aipamenaSylvia S Mader. Biology. Dubuque, Iowa: WCB, 1989.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
APA aipamena