Ragin, Charles C.
The Comparative method : moving beyond qualitative and quantitative strategies
University of California Press, 1987
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Williams, Malcolm, 1953-
Science and social science: an introduction
Routledge, 2000
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Blalock, Hubert M.
Conceptualization and measurement in the social science
Sage Publications, 1982
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Brown, Robert R.
Explanation in social science
Aldine Publishing, 1963
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Galt, Anthony H.
Models and the study of social change/ Larry J.Smith
John Wiley & Sons, 1976
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