@book { EchtkrassEineFrauenrztinberichtet,
    title = "Echt krass! Eine Frauenärztin berichtet",
    author = "Petra {Petersen}",
    year = "2020",
    publisher = "venusbooks",
    address = "München, Deutschland",
    url = "https://m.venusbooks.de/document/541597"
}