@book { Hauskrankenpflege,
    title = "Hauskrankenpflege",
    author = "Regina {Ertl} and Ursula {Kratzer} and Kai {Leichsenring}",
    year = "2017",
    publisher = "facultas",
    address = "Wien, Österreich",
    url = "https://campus-lizenzen.facultas.at/document/937695"
}