@book { CommunityHealthNurse,
    title = "Community Health Nurse",
    author = "Melitta {Horak} and Sonja {Haubitzer}",
    year = "2021",
    publisher = "facultas",
    address = "Wien, Österreich",
    url = "https://campus-lizenzen.facultas.at/document/1377037"
}