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Essex, England : Longman Group, 1988. ©2007
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2.
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Essex, England : Longman Group, 1993. ©2007
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3.
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Essex, England : Longman Group, 1992. ©2007
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4.
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Bethesda, Maryland : Keesing's Worldwide, 1998. ©2007
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5.
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London : Cartermill Publishing, 1995. ©2007
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6.
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London, [England] : Keesing's Worldwide, 2000. ©2007
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7.
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London, [England] : Longman, 1994. ©2007
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8.
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Rockville, Maryland : Keesing's Worldwide, 1999. ©2007
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9.
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London, [England] : Longman, 1991. ©2007
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10.
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London, England : Longman, 1996. ©2007
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