Ageing, health, and productivity. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Ageing, Health, and Productivity. Oxford University Press.
Lua MLA (8ú heag.)Ageing, Health, and Productivity. Oxford University Press.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.