APA (7th ed.) Zitazioa

(1972). Bibliographical services throught the World 1965-69. Unesco.

Chicago Style (17th ed.) Zitazioa

Bibliographical Services Throught the World 1965-69. Paris: Unesco, 1972.

MLA (9th ed.) Zitazioa

Bibliographical Services Throught the World 1965-69. Unesco, 1972.