Thompson, William J., author
John Wiley & Sons, 1997
Buku Referensi
Jonathan M. Borwein, Matthew P. Skerritt
Springer Science;, 2012
eBooks
Metcalf, Michael, author
Oxford University Press , 1990
Buku Teks
Nyhoff, Larry, author
Prentice-Hall, 1997
Buku Teks SO
Nolan, Richard L., author
Addison-Wesley, 1971
Buku Teks