Banks, Marcus
Visual methods in social research
Sage, 2015
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Forcese, Dennis P.
Social research methods
Prentice-Hall, 1973
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Judd, Charles M.
Research methods in social relations
Methuen, 1991
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Lee, Raymond M.
Unobtrusive methods in social research
Open University Press, 2000
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May, Tim
Social research: issues, methods and process
Open University Press, 2001
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