NetworkSolutions.com, "How Voice-Based Marketing Automation Can Help Your Small Business" BillionDollarPlayground.com, "Talking It Up with Voice-Based Marketing Automation" MarketingTechBlog, "Infographic: Evolution of Marketing Automation"
Truy cập ngày 18 tháng 6 năm 2012.  NetworkSolutions.com, "How Voice-Based Marketing Automation Can Help Your Small Business" BillionDollarPlayground.com, "Talking It Up with Voice-Based Marketing Automation" MarketingTechBlog, "Infographic: Evolution of Marketing Automation"