Elster, Jon
Explaining social behavior: more nuts and bolts for the social sciences
Cambridge University Press, 2015
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Cold formed machine bolts and hexagon nuts United States Department of Labor
S.l. The Foreign Operations Administration 1953,
 Buku Teks
Use of social sciences literature
edited by N. Roberts
Butterworth, 1977
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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, 2005
 Buku Teks SO