McNabb, James W.
Wolters Kluwer, 2015
Buku Teks SO
Kahn, Michael A.
John Wiley & Sons, cop, 2014
Buku Teks SO
by Rob Herbert, Gro Jamtvedt, Judy Mead, and Kare Birger Hagen
Elsevier, 2005
Buku Teks SO
Kennedy, David
Bay Books, 1988
Buku Referensi
Stern, Scott D.C.
McGraw-Hill , 2015
Buku Teks SO