@book { Sozialwissenschaftum1900,
    title = "Sozialwissenschaft um 1900",
    author = "Friedrich {Lenger}",
    year = "2011",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-00369-7",
    url = "https://www.peterlang.com/document/1054161"
}