@book { Peoplefotografie,
    title = "Peoplefotografie",
    author = "Frank {Eckgold} and Stephanie {Eckgold}",
    year = "2013",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403203"
}