R. Stamatov, Positive Education: Content, Approaches, Perspectives

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R. Stamatov, T. Kostadinova, Positive Education, Well-being, and Health

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R. Stamatov, Sv. Sariyska, Positive Psychology.

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R. Stamatov, Sv. Sariyska, Character Resilience.

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R. Stamatov, Sv. Sariyska, Character Strengths. Guide and Program for Developing Strengths.

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R. Stamatov, Sv. Sariyska, The Power of Self-Control.