@book { Haltungerweitern,
    title = "Haltung erweitern",
    subtitle = "Transformationsimpulse: ICH, WIR, ALLE gestalten Transformation",
    author = "Martin {Permantier}",
    year = "2023",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1369537"
}