Waterman, Donald A., author
Addison-Wesley, 1987
Buku Teks
Levine, Robert l., author
McGraw-Hill, 1988
Buku Teks
Rolston, David W., author
McGraw-Hill, 1988
Buku Teks
Walker, Terry, author
The S. Klien News Letter, 1986
Buku Teks
Begg, Vivienne
Kogan Page, 1987
Buku Teks