TY  - RPRT
TI  - Participation in extracurricular physical activity programs at middle schools.
AU  - Holly S Powers
AU  - Terry L Conway
AU  - Thomas L McKenzie
AU  - James F Sallis
AU  - Simon J Marshall
PY  - 2002
DO  - 10.1080/02701367.2002.10609007
UR  - https://pubmed.ncbi.nlm.nih.gov/12092893/
ID  - 12092893
ER  -