Palmer, Joel
Ann Arbor University Microfilms 1966
Buku Teks
Walker, Bryce S., author
Time-Life Books, 1973
Buku Teks
Gibb, Hamilton A.R., Sir, editor
London, Routledge & Kegen Paul, 1957
Buku Teks
Wallace, Robert, author
Amsterdam Time Life 1974
Buku Teks
Kaplan, Robert D., author
Random House, 2000
Buku Teks