@book { SchnelleHilfebeiAngst,
    title = "Schnelle Hilfe bei Angst",
    author = "Cora {Besser-Siegmund}",
    year = "2015",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403278"
}