Research in population economics: a research annual
edited by Julian L. Simon and Julie Da Vanzo
JAI Press, 1980
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McNeill, Patrick
Research methods
Routledge, 1990
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White, Theresa L.
Research methods
Wadsworth and Cengage Learning, 2013
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Leavitt, Fred
Research methods for behavioral scientists
C. Brown Publishers , 1991
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Research methods: guidance for postgraduates
edited by Tony Greenfield
Arnold , 1996
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