@book { RegierungPotsdamPrsidialregistraturRep2AIP,
    title = "Regierung Potsdam Präsidialregistratur (Rep. 2 A I P)",
    author = "Rudolf {Knaack} and Falko {Neininger} and Rita {Stumper}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095269"
}