Yorke, R.
Pergamon Press, 1986
Buku Teks
Riches, B.E.
ESM, 1989
Buku Teks
Tuinenga, Paul W., author
Prentice-Hall, 1995
Buku Referensi
Van Valkenburg, M.E. (Mac Elwyn), author
Prentice-Hall, 1982
Buku Teks
Graf, Rudolf F., author
Newnes, 1997
Buku Teks