Najderska, Małgorzata, and Jan Cieciuch. “Polish Adaptation of the Questionnaire for Measuring Character Strengths International Personality Item Pool – Values in Action (IPIP-VIA). Preliminary Results”. Studia Psychologica: Theoria et praxis 13, no. 1 (January 28, 2013): 65–83. Accessed December 7, 2025. https://czasopisma.uksw.edu.pl/index.php/sp/article/view/2792.