Crowley, James B., author
Princeton University Press, 1966
Buku Teks
Congresseional Quarterly, 1986
Buku Teks
Magdoff, Harry, author
Modern Reader Paperbacks, 1969
Buku Teks
Divine, Robert A., author
New Viewpoints, 1974
Buku Teks
Shaviv, Giora, author
Springer, 2012
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