Brzeźniak, Halina, et al. “The Influence of the Chosen Stress-Inducing Factors on the Professional Functioning of Nurses Depending on Their Age and Job Seniority”. Polish Journal of Public Health, vol. 121, no. 1, Jan. 2011, pp. 43-46, https://czasopisma.umlub.pl/pjph/article/view/1779.