Bartha , Éva, and Szilvia Perényi. “Communication of Trainers As One of the Means for Customer Retention in Fitness Clubs”. Applied Studies in Agribusiness and Commerce 9, no. 1-2 (September 1, 2015): 35–40. Accessed May 6, 2024. https://ojs.lib.unideb.hu/apstract/article/view/6482.