Odej, Adam, and Stanisław Tokarski. “Structure and Psychometrie Verification of the Personal Independence Questionnaire”. Studia Psychologica: Theoria et praxis, no. 9 (August 27, 2009): 233–250. Accessed March 29, 2024. https://czasopisma.uksw.edu.pl/index.php/sp/article/view/2720.