Wetherill, G. Barrie
Chapman & Hall, 1972
Buku Teks
Smith, Norman O.
Plenum Press, 1982
Buku Teks
Huber, Peter J.
Society for Industrial and Applied Mathematics, 1996
eBooks
Li, Jerome C.R.
Edwards Brothers, 1964
Buku Teks
Bryant, Edward C.
McGraw-Hill Book , 1966
Buku Teks