1. A Theory of Human Motivation;Maslow;PsychologicalReview,1943
2. Motivational Strategies in the Language Classroom. 3rd. Edition;Dörnyei,2003
3. Herzberg, F. 1966. Workandthe Nature of Man. Cleveland, World Publishing.
4. Brain research: Brain-compatible learning;Herrold;Educational Horizons,1989
5. Work motivation in organizational behavior. 2nd ed;Pinder,2011