O`Leary, De Lacy
Arabic thought and its place in history
Hill University of North Carolina Press, 1949
 Buku Teks
Allen, J. W., author
A history of political thought in the sixteenth century
Methuen, 1951
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Taylor, Overton H.
A History of economic thought/ Overton H. Taylor
Kogakusha Company,Ltd., 1960
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Gettell, Raymond G.
History of American political thought / Raymond G. Gettell
Appleton-Century-Crofts, 1928
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Canning, Joseph
A history of medieval political thought 300-1450 /Joseph Canning
Routledge, 1996
 Buku Teks
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