Борисова, О. В., and Ю. П. Мічуда. “Marketing As Means of Adaptation of Professional Tennis to Conditions of the Modern Market”. Slobozhanskyi Herald of Science and Sport, no. 4(27), Dec. 2011, pp. 186-9, https://journals.uran.ua/index.php/1991-0177/article/view/29202.