Dahlan, N. D., & Muhamad, T. A. (2017). Mental toughness and academic achievement among footballers at National University of Malaysia: Kekuatan mental dan prestasi akademik atlet bola sepak Universiti Kebangsaan Malaysia. Jurnal Sains Sukan & Pendidikan Jasmani, 6(1), 21–35. https://doi.org/10.37134/jsspj.vol6.1.3.2017