@book { CocoAusbildungzurO,
    title = "Coco - Ausbildung zur O",
    author = "Ana {Riba}",
    year = "2012",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    doi = "10.3239/9783943835342",
    url = "https://m.dotbooks.de/document/196010"
}