Stavrev, S.     Interrelation between moral-will qualities and ways of thinking, with male and female students, practicing basketball in educational groups in the university of national and world economy [Текст] / S. Stavrev, V. Tsvetkov // Olympic Sports and Sport for All. Sport, Stress, Adaptation : proceeding book of XVI International Scientific Congress and VI International Scientific Congress (17-19 May 2012 ) : extra issue of Sport and science / ed. staff: P. Gashev, D. Dasheva, S. Videnova ; National Sport Academy "Vassil Leski". — Sofia, 2012. — P. 74-77.