@book { Eibengift,
    title = "Eibengift",
    author = "Ottilie {Arndt} and Lydia {Ostermeier}",
    year = "2013",
    publisher = "hey! publishing",
    address = "München, Deutschland",
    doi = "10.3239/9783942822602",
    url = "https://www.heypublishing.com/document/211705"
}