Alvariñas-Villaverde, M., C. López-Villar, M. A. Fernández-Villarino, and R. Alvarez-Esteban. “Masculine, Feminine and Neutral Sports: Extracurricular Sport Modalities in Practice”. Journal of Human Sport and Exercise, vol. 12, no. 4, Dec. 2017, pp. 1278-8, doi:10.14198/jhse.2017.124.14.