Nowiński , J. M. ““Ecclesia Est paradisus” – Interpretation of the Church As Paradise on the ‘Plan of Saint Gall’ of 819”. Seminare. Learned Investigations, vol. 41, no. 2, Sept. 2022, pp. 127-35, https://czasopisma.uksw.edu.pl/index.php/s/article/view/10227.