Christensen, C. M. (2012). How Will You Measure Your Life? (1 st.). Harper Collins.
Lua i Stíl Chicago (17ú heag.)Christensen, Clayton M. How Will You Measure Your Life? 1 st. Harper Collins, 2012.
Lua MLA (9ú heag.)Christensen, Clayton M. How Will You Measure Your Life? 1 st. Harper Collins, 2012.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.