APA (7th ed.) Zitazioa

(1968). Language problems of developing nations. John Willey & Sons Inc..

Chicago Style (17th ed.) Zitazioa

Language Problems of Developing Nations. New York: John Willey & Sons Inc., 1968.

MLA (9th ed.) Zitazioa

Language Problems of Developing Nations. John Willey & Sons Inc., 1968.