Tomasi, Wayne, author
Prentice-Hall, 1998
Buku Teks
Siswanto Sutojo, author
Damar Mulia Pustaka, 2003
Buku Teks
Atkinson, Toby D., author
Springfield, 1994
Buku Referensi
Doll, Dixon R., author
John Wiley & Sons, 1978
Buku Teks
edited by Harry R. Karp
McGraw-Hill, 1980
Buku Referensi