APA (7th ed.) Citation

Rosenthal, K., Hünnies-Stemann, J., & Knefelkamp, N. User groups: A simple way to increase customer retention. LLC "CPC "Business Perspectives".

Chicago Style (17th ed.) Citation

Rosenthal, Klaus, Jessica Hünnies-Stemann, and Nadine Knefelkamp. User Groups: A Simple Way to Increase Customer Retention. LLC "CPC "Business Perspectives".

MLA (9th ed.) Citation

Rosenthal, Klaus, et al. User Groups: A Simple Way to Increase Customer Retention. LLC "CPC "Business Perspectives".