Martín-Moya, Ricardo, Pedro Jesús Ruiz-Montero, Enrique Rivera García, and George Leeson. “Psychological and Environmental Factors for Older Adults to Exercise: A Systematic Review”. Revista de Psicología del Deporte (Journal of Sport Psychology) 29, no. 2 (September 30, 2020): 93–104. Accessed April 25, 2024. https://www.rpd-online.com/index.php/rpd/article/view/16.