@book { FruchtbarkeitundFamilienplanunginKolumbien,
    title = "Fruchtbarkeit und Familienplanung in Kolumbien",
    author = "Jolanda {Koller}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1071682"
}