Murray, James D.
O’Reilly & Associates, 1994
Buku Referensi
Hill, Francis S., author
Macmillan, 1990
Buku Teks
Hearn, Donald, author
Prentice-Hall, 1986
Buku Teks
Wolfe, R. J., author
Oxford University Press, 2000
Multimedia
Aftab A. Mufti, author
Reston Publishing , 1983
Buku Teks