Παραπομπή σε μορφή APA (7η εκδ.)

Flennert, M., König, H., & Hajek, A. (2019). The association between voluntary work and health care use among older adults in Germany. BMC.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Flennert, Maike, Hans-Helmut König, και André Hajek. The Association Between Voluntary Work and Health Care Use Among Older Adults in Germany. BMC, 2019.

Παραπομπή σε μορφή MLA (9th εκδ.)

Flennert, Maike, et al. The Association Between Voluntary Work and Health Care Use Among Older Adults in Germany. BMC, 2019.