Barrett, Edward L., author
Foundation Press, 1977
Buku Teks
Keir, D. L. (David Lindsay), author
Oxford, 1959
Buku Teks
Kauper, Paul G., author
Little, Brown, 1966
Buku Teks
Gunther, Gerald, author
Foundation Press, 1970
Buku Teks
edited by Reavis Cox and Wroe Alderson
Richard D. Irwin, 1950
Buku Teks