Badicu, G., H. Gatterer, L. Balint, and M. Burtscher. “The Effects of Weekly Motivational Phone Calls on the Amount of Leisure Sports Activities and Changes in Physical Fitness”. Pedagogics, psychology, medical-biological problems of physical training and sports 22, no. 5 (September 30, 2018): 226-230. Accessed October 14, 2019. https://sportpedagogy.org.ua/index.php/PPS/article/view/959.