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London [u.a.]: Longman, 1991
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München: Florentz, 1978
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München: Beck, 1993
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New York: McGraw-Hill, [2018]
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Washington, DC: World Bank, 2009 ; 2009
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Washington, D.C: World Bank, Africa Region Human Development Department, 2010 ; 2010
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Upper Saddle River, N.J.: FTPress Delivers, c2013
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Upper Saddle River, New Jersey: FTPress Delivers, c2013
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American Library Association, 1970
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Ovid Technologies (Wolters Kluwer Health), 1983
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2012