@book { TeenagerschwangerschaftenWennMdchenMtterwerden,
    title = "Teenagerschwangerschaften. Wenn Mädchen Mütter werden...",
    author = "Ina {Hartmann}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836624510",
    url = "https://m.diplom.de/document/226455"
}