Kelly, Alfred H., author
W.W. Norton, 1983
Buku Teks
Wihdah Press , 1999
Buku Teks
Schneider, Herbert W., author
Columbia University Press, 1947
Buku Teks
Susana Nuccetelli, Ofelia Schutte, Otavio Bueno
Wiley, 2013
Buku Teks
edited by Carl J. Friedrich, Robert G. McCloskey
The Liberal Arts Press, 1954
Buku Teks