@book { MordbeiPoohCorner,
    title = "Mord bei Pooh Corner",
    author = "Gerald {Hagemann}",
    year = "2012",
    publisher = "hey! publishing",
    address = "München, Deutschland",
    doi = "10.3239/9783942822275",
    url = "https://www.heypublishing.com/document/206744"
}