Principi, A., Jensen, P. H., & Lamura, G. (2014). Active ageing: Voluntary work by older people in Europe. Policy Press.
Lua i Stíl Chicago (17ú heag.)Principi, Andrea, Per H. Jensen, agus Giovanni Lamura. Active Ageing: Voluntary Work by Older People in Europe. Bristol: Policy Press, 2014.
Lua MLA (9ú heag.)Principi, Andrea, et al. Active Ageing: Voluntary Work by Older People in Europe. Policy Press, 2014.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.