Sheps, Mindel C., author
Chicago Press, 1973
Buku Teks
Epstein, Benjamin, author
CRC Press (Taylor & Francis Group), 2008
Buku Teks
Edelstein-Keshet, Leah, author
Society for Industrial and Applied Mathematics, 2005
eBooks
Jones, A.J., author
Ellis Horwood and John Wiley & Sons, 1980
Buku Teks
Chartrand, Gary
Prindle, Weber & Schmidt , 1977
Buku Teks