Hallowell, Tommy
New York: Bantam Books, 1987
Buku Teks
Bhatia, Rajendra, 1952-
Society for Industrial and Applied Mathematics, 2007
eBooks
Steuerman, Emilia
Routledge, 2000
Buku Teks SO
Johnson, Frank
Robson Books, 1982
Buku Teks SO
Soetan Sjahrir, 1909-1966
The John Day Company, 1949
Buku Teks SO