Christensen, C. M. (2012). HOW WILL YOU MEASURE YOUR LIFE? HARPER COLLINS PUB.,UK.
Lua i Stíl Chicago (17ú heag.)Christensen, Clayton M. HOW WILL YOU MEASURE YOUR LIFE? HARPER COLLINS PUB.,UK, 2012.
Lua MLA (9ú heag.)Christensen, Clayton M. HOW WILL YOU MEASURE YOUR LIFE? HARPER COLLINS PUB.,UK, 2012.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.