Kann, Robert A.
University of California Press, 1968
Buku Teks
edited by Isaac Kramnick
[publisher not identified], 1969
Buku Teks
Wanlass, Lawrence C., author
Appleton-Century-Crofts, 1953
Buku Teks
Sabine, George H., author
Henry Holt, 1950
Buku Teks
Sabine, George H., author
Henry Holt , 1955, 1956
Buku Teks