Waite, Stephen, author
Prentice-Hall, 2000
Buku Teks
Ehrenberg, A.S.C., author
John Wiley & Sons, 1975
Buku Teks
Steinberg, Christian E.W., author
Springer, 2012
eBooks
Twesten, Gary, author
Illinois Record Printing, 1989
Buku Teks
Gibbs, Graham R, author
Sage , 2013
Buku Teks SO