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Articles
Books
AoPS Internet Guide

The Art of Problem Solving Resources pages include:

Articles for students, teachers, and parents, including How to Write a Solution, Building a Successful MATHCOUNTS Program, Stop Making Stupid Mistakes, and many more.
A list of some of our favorite books.
The AoPS Internet Guide, with links to:

Looking for a challenging algebra text? Preparing for MATHCOUNTS or the AMC exams?
Check out Art of Problem Solving's Introduction to Algebra by Richard Rusczyk.