Tamura, K., Goto, R., Yamada, N., Nakatsuka, K., Uchida, K., Horibe, K., Saeki, K., Encho, H., Tezuka, M., Mukaijo, M. and Ono, R. (2021) “Relationship between peer group size and active outdoor play in children aged 9-12 years: Oral Presentation A2.1”, The Health & Fitness Journal of Canada, 14(3). doi: 10.14288/hfjc.v14i3.381.