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3. Yukelson David, Ph.D., Coordinator of Sport Psychology Services Morgan Academic Support Center for Student-Athletes, Penn State University
4. Dr. Jim Loehr of the Human Performance Institute, in his book The New Toughness Training for Sports.
5. Jones, G., Hanton, S., & Connaughaton, D. (2002). What is This Thing Called Mental Toughness? An Investigation of Elite Sport Performers. Journal of Applied Sport Psychology, 14(3),209.
6. M.Sheard,” A cross National Analysis on Mental Toughness and Hardness in Elite University Rugby League Team” Preceptual Motor Skill ,2003, April : 96 (2) :455-462.
7. Alan Goldberg, “Just How Tough Are You ?” Swimming Technique (November- December, 1995): 20
8. Kevin Lamar Burke, “The Effect of a Perceptual Cognitive Training Program an Attention/Concentration Style and Performance of the Tennis Service,” Dissertation Abstracts International 49:12 (June, 1989): 3654-A.
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