Keskin, Özlem, A. Demir, and B. Şenol. “Reviewing Assertiveness Level of Elite Male and Female Athletes in Different Sports Branches”. Journal of Human Sciences, vol. 15, no. 4, Oct. 2018, pp. 1924-32, https://www.j-humansciences.com/ojs/index.php/IJHS/article/view/5319.