APA (7th ed.) Zitazioa
Cavagnaro, E., & Curiel, G. (2012). The three levels of sustainability. Greenleaf Pub..
Chicago Style (17th ed.) Zitazioa
Cavagnaro, Elena, eta George Curiel. The Three Levels of Sustainability. Sheffield, South Yorkshire, England: Greenleaf Pub., 2012.
MLA (9th ed.) Zitazioa
Cavagnaro, Elena, eta George Curiel. The Three Levels of Sustainability. Greenleaf Pub., 2012.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.