1. Hofmann, J.: The Synchronous Trainer’s Survival Guide. Pfeiffer (2003)
2. Salmon, G.: E-moderating: The Key to Teaching and Learning Online, 2nd edn. Taylor & Francis Books. Ltd., Taylor (2003)
3. Watkins, R.: 75 E-Learning Activities: Making Online Learning Interactive. Pfeiffer (2005)
4. Horton, W.: Evaluating E-learning. ASTD (2001)
5. Kirkpatrick, D.L.: Evaluating Training Programs: The Four Levels. Berrett-Koehler Publishers (2006)