Hatten, Timothy S.
Prentice-Hall, 1997
Buku Referensi
Schollhammer, Hans
John Wiley & Sons, 1979
Buku Teks
Zimmerer, Thomas W.
Prentice-Hall, 2002
Buku Teks
Macmillan, 1989
Buku Teks
Megginson, William L, Mary Jane Byrd, Charles R. Scott, Leon C. Megginson
Irwin, 1997
Buku Referensi