edited by Peter Clarke
Routledge, 1988
Buku Teks
edited by John Bowker
Oxford University Press, 1997
Buku Referensi
Time Incorporated, 1962
Buku Teks
Edey, Maitland A. (Amstrong), 1910-
Time-Life Books, 1975
Buku Teks
Saint-Laurent, George E., author
Mayfield, 2000
Buku Teks