Lua APA (7ú heag.)
ebrary, Inc, Bass, S. A., & Weiss, R. S. (2002). Challenges of the third age: Meaning and purpose in later life. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)
ebrary, Inc, Scott A. Bass, agus Robert Stuart Weiss. Challenges of the Third Age: Meaning and Purpose in Later Life. Oxford [England] ; New York: Oxford University Press, 2002.
Lua MLA (9ú heag.)
ebrary, Inc, et al. Challenges of the Third Age: Meaning and Purpose in Later Life. Oxford University Press, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.