@book { WrmepumpenDieKomplettAnleitungfrabsoluteEinsteiger,
    title = "Wärmepumpen – Die Komplett-Anleitung für absolute Einsteiger",
    author = "Oliver {Nachtigall}",
    year = "2024",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1458869"
}