Erber, J. T. (2005). Aging and older adulthood (ed.). Thomson.
Lua i Stíl Chicago (17ú heag.)Erber, Joan T. Aging and Older Adulthood. ed. Belmont, California: Thomson, 2005.
Lua MLA (9ú heag.)Erber, Joan T. Aging and Older Adulthood. ed. Thomson, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.