@book { 111RezeptefreinengesundenDarm,
    title = "111 Rezepte für einen gesunden Darm",
    author = "Dipl. oec. troph. Sonja {Carlsson}",
    year = "2022",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/1273534"
}