en Levy, B. R. (). „Eradication of Ageism requires addressing the enemy within”. The Gerontologist. 41 (5): 578–579. doi:10.1093/geront/41.5.578. PMID11574700.
en Levy, B. R. (). „Eradication of Ageism requires addressing the enemy within”. The Gerontologist. 41 (5): 578–579. doi:10.1093/geront/41.5.578. PMID11574700.