Merry del Val, Raffaele to Pacelli, Eugenio from before 25 January 1928, in: 'Kritische Online-Edition der Nuntiaturberichte Eugenio Pacellis (1917-1929)', document no. 20563, URL: www.pacelli-edition.de/en/Document/20563. Last access: 15-08-2024.Online since 20-01-2020.