Toynbee, Arnold J.
Meridian Books, 1958
Buku Teks SO
Takeo, Kuwabara
University of Tokyo Press , 1984
Buku Teks SO
Reilly, Kevin
Harper and Row, c1980
Buku Teks SO
Major, J. Russel
J.B. Lippincott, 1966
Buku Teks SO
edited by Michael W. Alssid and William Kenney
Holt, Rinehart and Winston, 1966
Buku Teks SO