APA (7th ed.) Zitazioa

EUROPA PUBLICATIONS LIMITDE. (1977). The world of learning 1977- 78 (ed.28.). Europa Publications limited.

Chicago Style (17th ed.) Zitazioa

EUROPA PUBLICATIONS LIMITDE. The World of Learning 1977- 78. ed.28. London: Europa Publications limited, 1977.

MLA (9th ed.) Zitazioa

EUROPA PUBLICATIONS LIMITDE. The World of Learning 1977- 78. ed.28. Europa Publications limited, 1977.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.