3Declan·Connaughtona; Ross.Wadeya; Sheldon.Hantona; Graham.Jonesb.The development and maintenance of mental toughness: perceptions of elite performers. Sports science, 2008,26(1):83-95.
4Sheldon-Hanton; Rich.Neil; Stephen DoMellalieu. Recent developments in competitive anxiety direction and competition stress research .International Review of Sport and Exercise Psychology, 2008(3):45-57.