Vertex Tax Cybrary
- Overview of U.S. state and local taxes implications of a company's e-commerce business.
- http://www.vertexinc.com/TaxCybrary/

Internet Taxation and the States
- Argues that a U.S. federal "moratorium" on Internet commerce taxes would erode state and local revenues and shift burdens to lower-income households.
- http://www.cbpp.org/512webtax.htm