@book { KircheundVergaberecht,
    title = "Kirche und Vergaberecht",
    subtitle = "Der vergaberechtliche Status der evangelischen Landeskirchen in Deutschland",
    author = "Burghard {Winkel}",
    year = "2004",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1097898"
}