APA (7th ed.) Zitazioa
Kula, E. (1998). History of environmental economic thought. Routledge.
Chicago Style (17th ed.) Zitazioa
Kula, Erhun. History of Environmental Economic Thought. London ; New York: Routledge, 1998.
MLA (9th ed.) Zitazioa
Kula, Erhun. History of Environmental Economic Thought. Routledge, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.