APA (7th ed.) Zitazioa
Emmel, T. C. (1977). Global perspectives on ecology. Mayfield.
Chicago Style (17th ed.) Zitazioa
Emmel, Thomas C. Global Perspectives on Ecology. Calif.: Mayfield, 1977.
MLA (9th ed.) Zitazioa
Emmel, Thomas C. Global Perspectives on Ecology. Mayfield, 1977.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.