Mannheim, Karl, 1893-1947
Freedom, power and democratic planning
Routledge & Kegan Paul Ltd, 1950
 Buku Teks SO
Rebentisch, Juliane, 1970-
The art of freedom : on the dialectics of democratic existence
Polity Press, 2016
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Smith, T.V.
The democratic way of life
A Mentor Book, 1960
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Cassinelli, C.W.
The politics of freedom: an analysis of the modern democratic state
University of Washington Press , 1961
 Buku Teks SO
Workman, Lewis C.
Mathematical foundations of life insurance
FLMI Insurance Education Program , 1989
 Buku Teks