May, Tim
Social research: issues, methods and process
Open University Press, 2001
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Re-thinking social research
edited by Beth Humphries and Carole Truman
Avebury, 1994
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Vaus, D.A. de
Surveys in social research
University College London Press, 1996
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Sjoberg, Gideon
A methodology for social research
Harper & Row Publishers, 1968
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Lee, Raymond M.
Unobtrusive methods in social research
Open University Press, 2000
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