1.
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London, [England] : Longman, 1970. ©2007
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2.
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London, [England] : Longmans, 1969. ©2007
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3.
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London, [England] : Longman Group Limited, 1973. ©2007
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4.
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London, [England] : Longman, 1971. ©2007
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5.
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©2007 London, [England] : Longman, 1972.
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6.
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London : Longmans, Green, and Co Ltd, 1966. ©2007
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7.
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London, [England] : Longman, Green and Co., 1968. ©2007
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8.
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London, [England] : Longmans, 1963. ©2007
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9.
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London, [England] : Longmans, Green, and Co., 1964. ©2007
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