Principi, A., Jensen, P. H., & Lamura, G. (2014). Active ageing: Voluntary work by older people in Europe. Policy Press.
Chicago-čujuhus (17. p.)Principi, Andrea, Per H. Jensen, juo Giovanni Lamura. Active Ageing: Voluntary Work by Older People in Europe. Bristol: Policy Press, 2014.
MLA-čujuhus (9. p.)Principi, Andrea, et al. Active Ageing: Voluntary Work by Older People in Europe. Policy Press, 2014.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.