EUROPA PUBLICATIONS LIMITDE. (1986). The world of learning 1987 (ed.37.). Europa Publications limited.
Chicago-referens (17:e uppl.)EUROPA PUBLICATIONS LIMITDE. The World of Learning 1987. ed.37. London: Europa Publications limited, 1986.
MLA-referens (9:e uppl.)EUROPA PUBLICATIONS LIMITDE. The World of Learning 1987. ed.37. Europa Publications limited, 1986.