Harper, Robert Gale, author
John Wiley , 1978
Buku Teks
Edited by Patrik O`Brian Holt; Noel Williams
Kluwer Academic Publishers , 1992
Buku Teks
editors by Jim E. Cole; Jackie Zajanc
The Haworth Press, 1987
Buku Teks
Ascher, Uri M., author
Society for Industrial and Applied Mathematics, 1998
eBooks
Hodnett, Edward
Harper & Brothers, 1955
Buku Teks