@book { AchilleRattiPapstPiusXIPredigtlehrerPredigerBibliothekar,
    title = "Achille Ratti / Papst Pius XI.: Predigtlehrer – Prediger – Bibliothekar",
    author = "Hermann-Josef {Reudenbach}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b12527",
    url = "https://www.peterlang.com/document/1110400"
}