LIU, Xiaoyang. Intrinsic and Extrinsic Motivation Affecting Learning Effectiveness in Physical Education of Junior College Students in China. International Journal of Social Sciences and Public Administration, U.K., v. 3, n. 2, p. 49–61, 2024. DOI: 10.62051/ijsspa.v3n2.07. Disponível em: https://wepub.org/index.php/IJSSPA/article/view/2079. Acesso em: 30 apr. 2026.