Irving, John, author
New York: Ballantine Books, 1968,
Buku Teks
Fisher, Irving Norton
Cornet Press Books, 1956
Buku Teks
Hyde, Harford Montgomery, author
Colorado Alan Swallow , 1948
Buku Teks
Talon, Henri A.
London Longmans 1956
Buku Teks
Yates, Frances A.
Cambridge Cambridge University Press 1934
Buku Teks