(1977). <The> world of learning 1977-78 (28th ed.). Europa Pub.
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Citação norma Chicago
<The> World of Learning 1977-78. 28th ed. London: Europa Pub, 1977.
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Citação norma MLA
<The> World of Learning 1977-78. 28th ed. Europa Pub, 1977.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.