JOHNS, D. P., & HA, A. S. C. (1999). Methodological Problems in Direct Observation of Children’s Dietary and Activity Behaviors: 應用「直接觀察法」在學童飲食及活動行為研究的問題. Asian Journal of Physical Education &Amp; Recreation, 5(1), 4–9. https://doi.org/10.24112/ajper.51214