Kirkpatrick, E.G.
John Wiley & Sons, 1970
Buku Teks
De Neufville, Richard, 1939-
New York: McGraw-Hill, 1971
Buku Teks
Morrow, Vincent
Prentice-Hall, 1991
Buku Referensi
Bockrath, Joseph T.
McGraw-Hill, 1977
Buku Teks
Goetsch, David L.
Pearson-Prentice Hall, 2005
Buku Teks