EUROPA PUBLICATIONS LIMITDE. (1976). The world of learning 1976- 77 (ed.27.). Europa Publications limited.
芝加哥风格引文EUROPA PUBLICATIONS LIMITDE. The World of Learning 1976- 77. ed.27. London: Europa Publications limited, 1976.
MLA引文EUROPA PUBLICATIONS LIMITDE. The World of Learning 1976- 77. ed.27. Europa Publications limited, 1976.
警告：这些引文格式不一定是100％准确.