@book { Fremdvgeln,
    title = "Fremdvögeln",
    author = "Zoe {Schreiber}",
    year = "2012",
    publisher = "hey! publishing",
    address = "München, Deutschland",
    doi = "10.3239/9783942822367",
    url = "https://www.heypublishing.com/document/206898"
}