@book { EinfacherEnergiesparenzuHause,
    title = "Einfacher Energie sparen zu Hause",
    author = "Rega {Kerner}",
    year = "2022",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1306499"
}