APA (7th ed.) Zitazioa
Williams, G. (1977). Towards lifelong education. Unesco.
Chicago Style (17th ed.) Zitazioa
Williams, Gareth. Towards Lifelong Education. Unesco, 1977.
MLA (9th ed.) Zitazioa
Williams, Gareth. Towards Lifelong Education. Unesco, 1977.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.