Pacelli, Eugenio to Gasparri, Pietro from 26 May 1927, in: 'Kritische Online-Edition der Nuntiaturberichte Eugenio Pacellis (1917-1929)', document no. 20988, URL: www.pacelli-edition.de/en/Document/20988. Last access: 19-05-2024.Online since 25-02-2019.