Drzewiecki, Bartosz. “Harmony: Psychological Meaning Today in Reference to Origins and Context in the Culture of the Middle Ages”. Studia Psychologica: Theoria et praxis, no. 6 (August 22, 2006): 249–260. Accessed May 6, 2024. https://czasopisma.uksw.edu.pl/index.php/sp/article/view/2631.