Albrecht Classen. (2019). The Crisis of Spirituality in the Late Middle Ages: From the Twelfth Century to the Protestant Reformation; with an Emphasis on the Reformatio Sigismundi (1439). Global Journal of Human-Social Science, 19(D2), 7–16. Retrieved from https://socialscienceresearch.org/index.php/GJHSS/article/view/2980