Zhang, Yuzi, Kathryn Burford, and Harold W. Kohl III. “The Association of Retirement and Leisure-Time Physical Activity Among Middle-Aged and Older US Adults: Mini-Oral Presentation C3.7”. The Health & Fitness Journal of Canada 14, no. 3 (September 30, 2021). Accessed May 3, 2024. https://hfjc.library.ubc.ca/index.php/HFJC/article/view/781.