Klimchuk, Marianne Rosner
John Wiley & Sons, 2006
Buku Teks SO
Hudson, Jennifer
Laurence King, 2011
Buku Referensi
Chowdhury, G.G.
Facet Publishing, 2007
Buku Teks SO
Amalia Suzianti
Faculty of Engineering, Universitas Indonesia, 2015
Artikel Jurnal
Flynn, Janet-Beth McCann
Prentice-Hall, 1984
Buku Teks SO