Freedman, V. A., Spillman, B. C., Andreski, P. M., Cornman, J. C., Crimmins, E. M., Kramarow, E., . . . Waidmann, T. A. (2013). Trends in Late-Life Activity Limitations in the United States: An Update From Five National Surveys. Demography, 50(2), 661-671. https://doi.org/10.1007/s13524-012-0167-z
Chicago-Zitierstil (17. Ausg.)Freedman, Vicki A., et al. "Trends in Late-Life Activity Limitations in the United States: An Update From Five National Surveys." Demography 50, no. 2 (2013): 661-671. https://doi.org/10.1007/s13524-012-0167-z.
MLA-Zitierstil (9. Ausg.)Freedman, Vicki A., et al. "Trends in Late-Life Activity Limitations in the United States: An Update From Five National Surveys." Demography, vol. 50, no. 2, 2013, pp. 661-671, https://doi.org/10.1007/s13524-012-0167-z.