Trythall, Marisa Patrulli (2010). "Pius XI and American Pragmatism". In Gallagher, Charles R.; Kertzer, David I.; Melloni, Alberto (eds.). Pius XI and America: Proceedings of the Brown University Conference. Lit Verlag. p. 28. ISBN9783643901460.
Aradi, Zsolt (1958). Pius XI: The Pope and the Man. New York: Hanover House. ISBN9781787205000. Retrieved 13 November 2017.[page needed] Republished by Muriwai Books, 2017. Aradi counts one Italian too many and misses the Portuguese cardinal. He counts the Austrian serving as nuncio to Bavaria as Germany rather than Austrian.