Cita APA (7th ed.)

EUROPA PUBLICATIONS LIMITDE. (1976). The world of learning 1977- 78 (ed.28.). Europa Publications limited.

Cita Chicago (17th ed.)

EUROPA PUBLICATIONS LIMITDE. The World of Learning 1977- 78. ed.28. London: Europa Publications limited, 1976.

Cita MLA (9th ed.)

EUROPA PUBLICATIONS LIMITDE. The World of Learning 1977- 78. ed.28. Europa Publications limited, 1976.