@book { ErnaskleinesWeihnachtswunder,
    title = "Ernas kleines Weihnachtswunder",
    author = "Kirsten {Rick}",
    year = "2013",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    doi = "10.3239/9783955204297",
    url = "https://m.dotbooks.de/document/263518"
}