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Gentry M, Shulman AD. Survey of sampling techniques in widowhood research, 1973-1983. J Gerontol. 1985;40(5):641-3doi: 10.1093/geronj/40.5.641.
Gentry, M., & Shulman, A. D. (1985). Survey of sampling techniques in widowhood research, 1973-1983. Journal of gerontology, 40(5), 641-3. https://doi.org/10.1093/geronj/40.5.641
Gentry, M, and Shulman, A D. "Survey of sampling techniques in widowhood research, 1973-1983." Journal of gerontology vol. 40,5 (1985): 641-3. doi: https://doi.org/10.1093/geronj/40.5.641
Gentry M, Shulman AD. Survey of sampling techniques in widowhood research, 1973-1983. J Gerontol. 1985 Sep;40(5):641-3. doi: 10.1093/geronj/40.5.641. PMID: 4031413.
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