Michels, Leo, author
Brooks/Cole, 1993
Buku Teks
Simpson, Peter, author
Chapman and Hall, 1994
Buku Teks
Helmprecht, H.L., author
McGraw-Hill, 1977
Buku Teks
Kaushik, R.K., author
SS. Mubaruk and Bross, 1995
Buku Teks
Roach, Don, author
McGraw-Hill, 1979
Buku Teks