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2. Self-determination theory and the facilitation of intrinsic motivation, social development, and well-being.
3. Lewin K., Field theory in Social Science (Sensor, St. Petersburg, 2000)
4. Thomas M., A New Attitude: Achieving Personal and Professional Success by Keeping a Positive Mental Outlook (AST Publishing Group, Moscow, 2006)
5. Covey S., The Seven Habits of Highly Effective People: Restoring the Character Ethic (Alpina Publisher, Moscow, 2017)