Theus, Martin
CRC Press, Taylor & Francis Group, 2009
Buku Teks
Hardle, Wolfgang Karl
Springer , 2012
eBooks
Wills, Graham
[, Springer], 2012
eBooks
Dielman, Terry E.
Duxbury Press, 1996
Buku Teks
Chartrand, Gary
Prindle, Weber & Schmidt , 1977
Buku Teks