Creswell, John W.
Qualitative inquiry and research design : choosing among five traditions
Sage, 1998
 Buku Teks SO
Creswell, John W.
Research design : qualitative, quantitative, approaches
Sage, 1994
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Neuman, William Lawrence, 1950-
Social research methods: qualitative and quantitative approaches
Allyn and Bacon, 2003
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Punch, Keith F.
Introduction to Social Research: quantitative and qualitative approaches
Sage, 1998
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Palys, T.S. (Theodore Stephen)
Research decisions : quantitative, qualitative, and mixed method approaches
Nelson Education, 2014
 Buku Teks SO