@book { PrivateSicherheitsdiensteundWaffenrecht,
    title = "Private Sicherheitsdienste und Waffenrecht",
    author = "Thomas {Storch}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1091347"
}