Jacobs, James A., author
Pearson/Prentice Hall, 2005
Buku Teks
Swanson, Stephen R., author
Prentice-Hall, 1997
Buku Teks
Cordon, William E.
McGraw-Hill, 1979
Buku Teks
Budinski, Kenneth G., author
Prentice-Hall, 1999
Buku Teks
Keyser, Carl A.
Prentice-Hall, 1956
Buku Teks