Graham, Ronald L.
Addison-Wesley, 1989
Buku Teks
Pace, Gordon J., editor
[, Springer-Verlag], 2012
eBooks
Cooke, D.J.
Cambridge Univeristy Press, 1984
Buku Teks
Stein, Clifford
Pearson, 2011
Buku Teks SO
Fejer, Peter A.
Springer-Verlag, 1991
Buku Teks