edited by Susann Ragsdale
McGraw-Hill, 1992
Buku Teks SO
Braunl, Thomas
Prentice-Hall, 1993
Buku Teks SO
LePage, Wilbur R.
Prentice-Hall, 1978
Buku Teks SO
Bradley, Stephen P.
Addison-Wesley, 1977
Buku Teks SO
Axelson, Jan
Lakeview Research , 2000
Buku Teks SO