Doyle, Michael P., author
John Wiley & Sons, 1980
Buku Teks
Fishel, Derry L., author
Macmillan, 1971
Buku Teks
Cooper, James W., author
John Wiley & Sons, 1980
Buku Teks
Pasto, Daniel J., author
[Publisher not identified], 1992
Buku Teks
Ault, Addison, author
Houghton Mifflin, 1979
Buku Teks