APA-čujuhus (7. p.)

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.

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