Pergamon Press, 1980
Buku Teks
Stewart, Gilbert W., author
Society for Industrial and Applied Mathematics, 1996
eBooks
edited by Howard S. Ellis and Henry C. Wallich
Macmillan, 1963
Buku Teks
edited by J. Rouquerol and K.S.W Sing
Elsevier, 1982
Buku Teks
Washington : Heldref Publication
Majalah, Jurnal, Buletin