Eckhardt, Homer
McGraw-Hill , 1998
Buku Teks
editor in chief, Mortimer J. Adler
Encyclopaedia Britannica, Inc., 1996
Buku Referensi
Schmitz, Homer H.
Aspen systems corporation, 1979
Buku Teks
See, Lisa, author
Vintage Books, 2012
Buku Teks
Stuart, Francis, 1912-
CSAAR, Division of Asian and International Studies, Griffith University, 1990
Buku Teks