1. https://www.runnersworld.com/training/a20800314/fun-creative-group-workouts/
  2. http://www.wilderdom.com/games/
  3. https://www.acefitness.org/
  4. http://www.europarl.europa.eu
  5. https://nobaproject.com/modules/motives-and-goals
  6. ARMSTRONGS HANDBOOK OF HUMAN RESOURCE MANAGEMENT PRACTICE, MOTIVATION
  7. Critical thinking as an educational ideal, David Hitchcock, May 2011.