Strong, Frank R., author
Dennis & Co., 1950
Buku Teks
Kauper, Paul G., author
Little, Brown, 1971
Buku Teks
Barrett, Edward L., author
Foundation Press, 1977
Buku Teks
Kauper, Paul G., author
Little, Brown, 1966
Buku Teks
Dowling, Noel T., author
Foundation Press, 1954
Buku Teks