Broyles, Robert W., author
Aspen Systems, 1981
Buku Teks
Krauel, Jacobo, author
Linksbooks, [date of publication not identified]
Buku Referensi
Donald J. Griffin, editor
Jones & Bartlett Learning, 2011
Buku Teks
Roberts, Robert, edited
Design Media Publishing, 2014
Buku Referensi
Deegan, Arthur X., author
Aspen Systems Corp., 1982
Buku Teks