- Card Web (Industry News) - www.cardweb.com
- Visa - www.visa.com
- Mastercard - www.mastercard.com
- American Express - www.americanexpress.com
- Discover - www.discovercard.com
- Electronic Transaction Association - www.electran.org
- NACHA-The Electronic Payments Organization - www.nacha.org
- Better Business Bureau - www.sandiego.bbb.org