NG IP, K.W.J. 1997. The Daily Activity of 11- to 18-year-old School Children: The Hong Kong Study: 香港11至18歲學童的日常起居活動. Asian Journal of Physical Education & Recreation. 3, 1 (Jun. 1997), 46–52. DOI:https://doi.org/10.24112/ajper.31185.