Marshall, Catherine
Designing qualitative research
Sage, 1999
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Viswanathan, Madhu
Measurement error and research design
SAGE Publ., 2005
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Sjoberg, Gideon
A methodology for social research
Harper & Row Publishers, 1968
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Babbie, Earl
The practice of social research
Cengage Learning, 2016
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Lee, Raymond M.
Unobtrusive methods in social research
Open University Press, 2000
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