Greeley, A. M. (1964). The challenge of living: Letter to a young man. Ave Maria Press.
Lua i Stíl Chicago (17ú heag.)Greeley, Andrew M. The Challenge of Living: Letter to a Young Man. Notre Dame, Ind.: Ave Maria Press, 1964.
Lua MLA (8ú heag.)Greeley, Andrew M. The Challenge of Living: Letter to a Young Man. Ave Maria Press, 1964.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.