Ilyina N.L., Lutkova N.V., Egorenko L.A., and Baranova M.V. “Comparative Analysis of Coach Motives in a Commercial and Non-Profit Sports Organization”. Theory and Practice of Physical Culture, no. 11, Nov. 2023, pp. 69-71, http://tpfk.ru/index.php/TPPC/article/view/840.