Buckley, Charles Burton, author
University of Malaya Press, 1969
Buku Teks
edited by Geoffrey Barraclough
Times Books, 1984
Buku Referensi
Published for Newsweek by Funk & Wagnalls, 1950
Buku Teks
Turnbull, C. M. (Constance Mary), author
Oxford University Press, 1985
Buku Teks
Powell, Robert, author
Periplus, 2004
Buku Teks