edited, Alberta M. Sbragia
Westview Press, 1983
Buku Teks
Gregorian, Vartan
Stanford University press, 1969
Buku Teks
Lehne, Richard A.
Longman, 1978
Buku Teks
State University of New York Press, 2006
Buku Teks
White, Gordon, author
Macmillan, 1993
Buku Teks