Pacelli, Eugenio to Gasparri, Pietro from 13 September 1928, in: 'Kritische Online-Edition der Nuntiaturberichte Eugenio Pacellis (1917-1929)', document no. 16973, URL: www.pacelli-edition.de/en/Document/16973. Last access: 06-12-2024.Online since 20-01-2020.