APA (7th ed.) Zitazioa
Ikerd, J. E. (2012). The essentials of economic sustainability. Kumarian Press.
Chicago Style (17th ed.) Zitazioa
Ikerd, John E. The Essentials of Economic Sustainability. Sterling, Va.: Kumarian Press, 2012.
MLA (9th ed.) Zitazioa
Ikerd, John E. The Essentials of Economic Sustainability. Kumarian Press, 2012.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.