APA (7th ed.) Citation

AC, O., RE, K., & SA, P. (1986). The age grading of physical activity among children. International journal of aging & human development, 24(2), 101. https://doi.org/10.2190/gp9t-d5bv-9fr1-ncu8

Chicago Style (17th ed.) Citation

AC, Ostrow, Keener RE, and Perry SA. "The Age Grading of Physical Activity Among Children." International Journal of Aging & Human Development 24, no. 2 (1986): 101. https://doi.org/10.2190/gp9t-d5bv-9fr1-ncu8.

MLA (9th ed.) Citation

AC, Ostrow, et al. "The Age Grading of Physical Activity Among Children." International Journal of Aging & Human Development, vol. 24, no. 2, 1986, p. 101, https://doi.org/10.2190/gp9t-d5bv-9fr1-ncu8.