Neuman, Lawrence W.
Basics of social research: qualitative and quantitative
Pearson New International edition, 2014
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Doing social research: a global context / Calaire Wagner, Barbara B. Kawulich, Marks Garner, editor
McGraw-Hill, 2012
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Palys, T.S. (Theodore Stephen)
Research decisions : quantitative, qualitative, and mixed method approaches
Nelson Education, 2014
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Tashakkori, Abbas
Mixed methodology : combining qualitative and quantitative approaches
Sage, 1998
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Babbie, Earl R.
The practice of social research
Cengage Learning, 2016
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