Farrington, B.
Henry Schuman, 1949
Buku Teks SO
Robert Maynard Hutchins, editor in chief
Encyclopaedia Britannica, Inc., 1952
Buku Referensi
edited by John C. Hunter
Wiley-Blackwell, 2010
Buku Teks SO
edited with an introd. by Edward H. Weatherly
Dell Publishing, 1962
Buku Teks SO
Hale, John R.
Time-Life International, 1969
Buku Teks SO