Pulido Pedrero, Silvia, et al. “Analysis of the Relationships Between Motivational Variables and Anxiety in Competing Judokas”. Sportis. Scientific Technical Journal of School Sport, Physical Education and Psychomotricity, vol. 3, no. 3, Aug. 2017, pp. 436-53, doi:10.17979/sportis.2017.3.3.1896.