DEGRAAF, D. Physical Education, Recreation, the Environment and Our Quality of Life: 體育、康樂、環境與優質人生的關係. Asian Journal of Physical Education & Recreation, [S. l.], v. 3, n. 2, p. 34–36, 1997. DOI: 10.24112/ajper.31194. Disponível em: https://ejournals.lib.hkbu.edu.hk/index.php/ajper/article/view/1194. Acesso em: 1 may. 2024.