For technical information about Data Matrix, Maxicode, PDF417, or MicroPDF417 see AIM International Symbology Specification.
For technical information about UPC-A, UPC-E, bar codes, RSS codes (now named GS1 DataBar), or composite codes, see the GS1 organization website http://www.gs1.org.
For technical information about Pharmacode, see The Pharmacode Guide by Laetus.
For technical information about Postnet, go to the United States Postal Service site, (http://www.usps.com). Type POSTNET Barcode Certification in the Search USPS.com field and click go.
For technical information about Planet code, go to the United States Postal Service site, (http://www.usps.com). Type Confirm User Guide in the Search USPS.com field and click go.