Dettmana, Terry
Que Corporations, 1993
Buku Referensi
Salemba Infotek, 2002
Buku Teks
Sanchez, Julio, author
McGraw-Hill, 1995
Buku Teks
by William S. Davis ... [and others]
Benjamin/Cummings, 1990
Buku Teks
Rochkind, Marc J., author
Prentice-Hall, 1988
Buku Teks