Fries, J. F. (1989). Aging well: A guide for successful seniors. Addison-Wesley.
Lua i Stíl Chicago (17ú heag.)Fries, James F. Aging Well: A Guide for Successful Seniors. Reading, MA: Addison-Wesley, 1989.
Lua MLA (9ú heag.)Fries, James F. Aging Well: A Guide for Successful Seniors. Addison-Wesley, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.