Smoleń, Ewa, Elżbieta Cipora, Joanna Zacharska, and Lucyna Gazdowicz. “Physical Activity Among Students of the University of the Third Age (U3A)”. Nursing in the 21st Century 11, no. 4(41) (December 1, 2012): 55–60. Accessed July 26, 2025. https://czasopisma.umlub.pl/piel21w/article/view/2273.