Constant Contact - Email Marketing Hints & Tips® Articles  
  Email Insider (2006) - E-mail List Building Basics  
  Fleishman, Glenn (2004) - Building a Mailing List  
  Internet Based Moms - Marketing Your Business Through Email: Lesson 2: Building Your Email Mailing List  
  M&R Strategies (2006) - Do Images (in Email) Help or Hurt?  
  M&R Strategies (2006) - eNonprofit Benchmarks Study