@book { VerhaltensproblemebeiderKatze,
    title = "Verhaltensprobleme bei der Katze",
    author = "Patricia {Kaulfuß}",
    year = "2019",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/491941"
}