Qualitative research practice Principles of risk management and insurance
Clive, Seale, Giampietro Gobo, Jaber F. Gubrium, David Silverman
Sage Publications, 2008
 Buku Teks
Qualitative research in social work / edited, Edmund Sherman
Columbia University Press, 1994
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Silverman, David
Doing qualitative research / David Silverman
Sage , 2013
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Patton, Michael Quinn
Qualitative research and evaluation methods
SAGE, 2015
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Babbie, Earl
The practice of social research
Wadsworth, 2010
 Buku Teks