“Appendix C: Age Cohorts of the Population.” Indicators of Trends in American Education, by ABBOTT L. FERRISS, Russell Sage Foundation, New York, N. Y., 1969, pp. 269–275, www.jstor.org/stable/10.7758/9781610448321.18. Accessed 25 Nov. 2020.
FERRISS, A. (1969). Appendix C: Age Cohorts of the Population. In Indicators of Trends in American Education (pp. 269-275). New York, N. Y.: Russell Sage Foundation. Retrieved November 25, 2020, from http://www.jstor.org/stable/10.7758/9781610448321.18
FERRISS, ABBOTT L. "Appendix C: Age Cohorts of the Population." In Indicators of Trends in American Education, 269-75. New York, N. Y.: Russell Sage Foundation, 1969. Accessed November 25, 2020. http://www.jstor.org/stable/10.7758/9781610448321.18.
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