@book { LebenimTeufelskreis,
    title = "Leben im Teufelskreis",
    author = "Maria von {Welser}",
    year = "2013",
    publisher = "hey! publishing",
    address = "München, Germany",
    doi = "10.3239/9783942822466",
    url = "https://www.heypublishing.com/document/208582"
}