Zwierzyńska, Anna, et al. “Assessment of the Level of Knowledge about Health Behaviors and Puerperium of Various Social Groups in the Świętokrzyskie Voivodeship During the Covid-19 Pandemic”. Journal of Education, Health and Sport, vol. 12, no. 2, Feb. 2022, pp. 56-68, doi:10.12775/JEHS.2022.12.02.006.