@book { VonderHobbyhurezurProfessionellen,
    title = "Von der Hobbyhure zur Professionellen",
    author = "Conny {Colazo}",
    year = "2021",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1039803"
}