CS 115 Introduction to Computer Programming Page

Graphics.py the file you need for the graphics library
Zelle Graphics Reference as a web site
Zelle Graphics reference as one PDF
HINT about Zelle graphics! You have to SAVE your program file before Python knows where to look for the graphics.py file. (This is if you did not put the graphics.py file in the site-packages folder.) It's a good habit to get into anyway, saving your program regularly.
Another page about Zelle Graphics be cautious with this one, it is a slightly different version of Zelle
List of Tkinter colors
Very useful display of all Tkinter colors with their names

Books that can make you a better programmer note: some of the descriptions are in weak English. I have read most of them myself and do recommend them.