@book { ApothekerundDrogist,
    title = "Apotheker und Drogist",
    subtitle = "Zur Geschichte einer Konkurrenz",
    author = "Constanze {Schäfer}",
    year = "2009",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1106534"
}