Lee, Raymond M.
Unobtrusive methods in social research
Open University Press, 2000
 Buku Teks
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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Berg, Bruce Lawrence, 1954-
Qualitative reseach methods for the social sciences
Allyn and Bacon, 1989
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Berg, Bruce Lawrence, 1954-
Qualitative research methods for the social sciences
Pearson, 2014
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