editor, Robert H. Perry, Don W. Green, James O. Maloney
McGraw-Hill, 1997
Buku Referensi
Perry, Robert H.
McGraw-Hill, 1999
Multimedia
Chopey, Nicholas P.
McGraw-Hill, 1994
Buku Referensi
editor, Robert H. Perry, Don W. Green, James OP. Moloney
McGraw-Hill, 1997
Buku Referensi
Lewis, Jack R., author
Prentice-Hall, 1982
Buku Referensi