http://www.eslflow.com/describinggraphstables.html
http://www.vub.ac.be/khnb/itv/oktober/jan/gb97-2.htm
http://www.bath.ac.uk/elc/eap/graphs/vocabulary.htm
http://pioneer.netserv.chula.ac.th/~pkanchan/html/graph.htm
It's basically all you need. Good Luck:)