Denscombe, Martyn
Research Proposals a Pratical guide
Mc Graw Hill, 2012
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Stebbins, Robert A.
Exploratory research in the social sciences
Sage, 2001
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Research methods in the social sciences
edited, Bridget Somekh, Cathy Lewin
Sage Publications , 2005
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A guide to the social sciences
edited by Norman MacKenzie
The New American Library, 1968
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A reader's guide to the social sciences
edited by Bert F. Hoselitz
Free Press, 1959
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