Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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