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), pp. 38–42. doi: 10.24112/ajper.81268.