edited by Andreas Bandak and Lars Hojer
John Wiley & Sons, 2015
Buku Teks SO
edited by Donald D. Wood
Emerald, 2016
eBooks
Norman, Donald A.
W.H. Freeman, 1975
Buku Teks SO
Willis, James F.
North West Publishing, 2002
Buku Teks
Hollander, Stanley C.
Michigan State University , 1960
Buku Teks SO