@book { EhrenamtlichePolizeihelferundHilfspolizeibeamte,
    title = "Ehrenamtliche Polizeihelfer und Hilfspolizeibeamte",
    author = "Philipp {Stein}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b18792",
    url = "https://www.peterlang.com/document/1140478"
}