The Direct Marketing Association – www.the-dma.org

The Print Council - www.theprintcouncil.org

Society for Service Professionals in Printing – www.sspp.org

Graphics Arts Information Network Printing Industries of America – www.gain.org

Envelope Manufacturers Association – www.envelope.org

Association for Postal Commerce – www.postcom.org

Printing Industry of Minnesota – www.pimn.org

Mail and Jobs - www.mailandjobs.com

Graphic Arts Monthly – www.gammag.com

DM News Magazine – www.dmnews.com

Direct Magazine – www.directmag.com

What They Think – www.whattheythink.com

Printing Impressions – www.piworld.com

General Requirements for Applications in Commercial Offset Lithography – www.gracol.org

National Association for Printing Leadership – www.napl.org

Flexographic Technical Association – www.flexography.org

Mailing & Fulfillment Service Association – www.mfsanet.org

U.S. Postal Service – www.usps.com

Postal Explorer – http://pe.usps.gov

Canada Post – www.canadapost.ca

Rochester Institute of Technology – www.rit.edu

University of Wisconsin, Stout – www.uwstout.edu