@book { ProfessorDrWilhelmKahlLebenzwischenWissenschaftundPolitik,
    title = "Professor Dr. Wilhelm Kahl – Leben zwischen Wissenschaft und Politik",
    author = "Stefan {Burghard}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1100902"
}