Douglas, Graham
Elsevier, 2009
Multimedia
Wolters Kluwer, Lippincott Williams & Wilkins, 2008
Buku Teks SO
edited by C. Steven LaRue
Fitzroy Dearborn Publishers, 1997
Buku Referensi
Bickley, Lynn S.
J.B. Lippincott, 1996
Buku Teks SO
Jarvis, Carolyn
Elsiver Saunder, 2012
Buku Teks SO