Yin, Robert K.
Case study research : design and methods
Sage, 1989
Buku Teks SO
Travers, Max
Qualitative research through case studies
Sage Publications, 2002
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May, Tim
Social research: issues, methods and process
Open University Press, 2001
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Judd, Charles M.
Research methods in social relations
Methuen, 1991
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Research methods in social relations
Louise H. Kidder
Holt, Rinehart and Winston, 1981
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