Open University, Johnson, J., & Slater, R. (1993). Ageing and later life. Sage Publications.
Lua i Stíl Chicago (17ú heag.)Open University, Julia Johnson, agus Robert Slater. Ageing and Later Life. London ; Thousand Oaks, Calif.: Sage Publications, 1993.
Lua MLA (8ú heag.)Open University, et al. Ageing and Later Life. Sage Publications, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.