Stychno, Ewa, Justyna Zaręba, Kinga Kulczycka, and Bogumiła Kosicka. 2018. “Opinion on the Health and Social Functioning of Nurses Employed in a Shift Work System. Selected Aspects”. Journal of Education, Health and Sport 8 (6):302-13. https://apcz.umk.pl/JEHS/article/view/5595.