Pacelli, Eugenio to Pizzardo, Giuseppe from 19 May 1921, in: 'Kritische Online-Edition der Nuntiaturberichte Eugenio Pacellis (1917-1929)', document no. 11229, URL: www.pacelli-edition.de/en/Document/11229. Last access: 05-04-2025.Online since 14-05-2013, last modification 10-03-2014.