V. Serrano-Huete, E. Lozano-Aguilera, M. Terán-Torres, J. Laredo-Aguilera, and J. Párraga-Montilla, “Effects on self-perception in people over 60 years of a program of physical activity in water”, RICCAFD, vol. 7, no. 2, pp. 128–136, Jul. 2018.