Eisenhower National Clearinghouse -The Eisenhower National Clearinghouse is located at The Ohio State University and is funded through the U.S. Department of Education. Use this massive search engine to do research on math topics.

Phi Delta Kappan International -Phi Delta Kappa is a professional organization for teachers of all fields. Their emphasis is publicly supported education and a democratic way of life. Chapter services and educational research are highlights.

National Council of Teachers of Mathematics -This is the site of the largest mathematics association. It contains the document Principles & Standards Document which includes examples and references.