@book { MutterschutzauchfrSelbstndige,
    title = "Mutterschutz (auch) für Selbständige?",
    author = "Kirsten {Knigge}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b15227",
    url = "https://www.peterlang.com/document/1057344"
}