@book { 111RezeptefreingesundesHerz,
    title = "111 Rezepte für ein gesundes Herz",
    author = "Sonja {Carlsson}",
    year = "2016",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403936"
}