एपीए उद्धरण

Mollenkopf, H., & Walker, A. (2020). Quality of Life in Old Age. Springer Netherlands.

शिकागो स्टाइल उद्धरण

Mollenkopf, Heidrun, और Alan Walker. Quality of Life in Old Age. Springer Netherlands, 2020.

एमएलए उद्धरण

Mollenkopf, Heidrun, और Alan Walker. Quality of Life in Old Age. Springer Netherlands, 2020.