LOUIE, L. and YUEN, H.W. 2002. Physical Activity Level among Hong Kong Secondary School Students during Physical Education Lessons and Extra-curricular Activities: A Descriptive Study: 初步探索香港中學生於體育課及課外活動的身體活動量. Asian Journal of Physical Education & Recreation. 8, 2 (Dec. 2002), 38–42. DOI:https://doi.org/10.24112/ajper.81268.