APA (7th ed.) Zitazioa

EUROPA PUBLICATIONS LIMITDE. (1976). The world of learning 1976- 77 (ed.27.). Europa Publications limited.

Chicago Style (17th ed.) Zitazioa

EUROPA PUBLICATIONS LIMITDE. The World of Learning 1976- 77. ed.27. London: Europa Publications limited, 1976.

MLA (9th ed.) Zitazioa

EUROPA PUBLICATIONS LIMITDE. The World of Learning 1976- 77. ed.27. Europa Publications limited, 1976.