Goto, R., K. Kitagaki, K. Horibe, K. Tamura, N. Yamada, and R. Ono. “Relationship Between Perceived Physical Competence and Outdoor Play Among Children Aged 9-12 Years: Oral Presentation A2.2”. The Health & Fitness Journal of Canada, vol. 14, no. 3, Sept. 2021, doi:10.14288/hfjc.v14i3.382.