Brecht, Arnold
Political theory: the foundations of twentieth-century political thought
Princenton University Press, 1968
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Gower, Barry
Scientific method: an historical and philosophical introduction
Routledge, 1997
 Buku Teks SO
Computing methods in optimization problems
Springer-Verlag, 1969
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Numerical methods in thermal problems
edited by R.W. Lewis
Pineridge Press, 1979
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The study of society : methods and problems
edited by F.C. Bartlett
Kegan Paul, Trench, 1946
 Buku Teks SO