Freeman-Bell, Gail
Prentice-Hall, 1996
Buku Teks SO
Danny Samson
Prentice-Hall, 2001
Buku Teks
Cleland, David I.
McGraw-Hill , 1980
Buku Teks SO
Cleland, David I.
McGraw-Hill, 1981
Buku Teks SO
John E. Ullmann, editor, Donald A. Christman, Bert Holtje, associate editors.
John Wiley & Sons, 1986
Buku Referensi