Collier, M. (2011). The ultimate online customer service guide: How to connect with your customers to sell more! John Wiley & Sons.
Citace podle Chicago (17th ed.)Collier, Marsha. The Ultimate Online Customer Service Guide: How to Connect with Your Customers to Sell More! Hoboken, N.J.: John Wiley & Sons, 2011.
Citace podle MLA (9th ed.)Collier, Marsha. The Ultimate Online Customer Service Guide: How to Connect with Your Customers to Sell More! John Wiley & Sons, 2011.
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