Le Roy, Michael K.
Research methods in political science : an introduction using MicroCase
Wadsworth and Cengage Learning, 2013
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Fisher, Ronald A.
Statistics methods for research workers
Oliver and Boyd, 1950
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Coolican, Hugh
Research methods and statistics in psychology
Hodder & Stoughton, 2009
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Coolican, Hugh
Research methods and statistics in psychology
Psychology Press, 2014
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Weiss, Robert S.
Statistics in social research : an introduction
N.Y. Wiley , 1968
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