GARCÍA FERNÁNDEZ, J.; GÁLVEZ RUÍZ, P.; BERNAL GARCÍA, A.; VÉLEZ COLÓN, L. Economic expenditure in low-cost fitness centers: Differences according to the loyalty and characteristics of the client. SPORT TK-EuroAmerican Journal of Sport Sciences, [S. l.], p. 137–144, 2016. DOI: 10.6018/254141. Disponível em: https://revistas.um.es/sportk/article/view/254141. Acesso em: 29 sep. 2026.