APA (7th ed.) Zitazioa
Gheddo, P. (1973). Why is the third world poor? Orbis Books.
Chicago Style (17th ed.) Zitazioa
Gheddo, Piero. Why Is the Third World Poor? New York: Orbis Books, 1973.
MLA (9th ed.) Zitazioa
Gheddo, Piero. Why Is the Third World Poor? Orbis Books, 1973.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.