Artikel Jurnal
Birkhoff, Garrett, author
Society for Industrial and Applied Mathematics, 1984
eBooks
Marshall, W.T.
Pitman, 1978
Buku Teks
King, Horace Williams, 1874-1951, author
McGraw-Hill, 1963
Buku Referensi
Brater, Ernest F. (Ernest Frederick), 1912-2003, author
McGraw-Hill, 1976
Buku Referensi