McConnell, David
McGraw-Hill, 2010
Buku Teks
Day, Robert W.
McGraw-Hill, 1999
Buku Teks SO
Day, Robert W.
McGraw-Hill, 1999
Buku Teks SO
Kramer, Steven Lawrence
Prentice-Hall, 1996
Buku Teks SO
Ramsey, William L.
Holt, Rinehart and Winston, 1961
Buku Teks