APA-referens (7:e uppl.)
Collier, M. (2011). The ultimate online customer service guide: How to connect with your customers to sell more! John Wiley & Sons.
Chicago-referens (17:e uppl.)
Collier, Marsha. The Ultimate Online Customer Service Guide: How to Connect with Your Customers to Sell More! Hoboken, N.J.: John Wiley & Sons, 2011.
MLA-referens (9:e uppl.)
Collier, Marsha. The Ultimate Online Customer Service Guide: How to Connect with Your Customers to Sell More! John Wiley & Sons, 2011.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.