* [http://users.tricity.wsu.edu/~bobl/cpts481/tkinter_nmt.pdf Tkinter reference: A GUI for Python] (''pdf, tricity.wsu.edu'') | * [http://users.tricity.wsu.edu/~bobl/cpts481/tkinter_nmt.pdf Tkinter reference: A GUI for Python] (''pdf, tricity.wsu.edu'') |