B. M. Nowak, M. Kalinowski, I. NIewiadomska, A. Woźniak, and W. Remijasz, “The Perception of the Sources of Self-Efficacy and the Intensity of the Dimensions of Attitude Towards Volunteering Amongst Prisoners”, PBE, vol. 1, no. 49, pp. 143–162, Aug. 2025.