Tomczak, Steven P.
John Wiley & Sons, 1982
Buku Teks
Gildersleeve, Thomas R., author
Prentice-Hall, 1978
Buku Teks
Awad, Elias M., author
Prentice-Hall, 1966
Buku Teks
Fried, Louis, author
Reston Publishing, 1979
Buku Teks
Vazsonyi, Andrew, author
Richard D. Irwin, 1980
Buku Teks