Kolb, Burton A.
Irwin, 1988
Buku Teks SO
Curran, Ward S.
McGraw-Hill, 1970
Buku Teks SO
Arthur J Keown
Pearson : Prentice Hall, [2005;2005, 2005]
Buku Teks SO
Gup, Benton E.
John Wiley & Sons, 1987
Buku Teks SO
Martin, Titman Keown
Essex Pearson, , 2014
Buku Teks SO