@book { MnnlichkeitundAngst,
    title = "Männlichkeit und Angst",
    subtitle = "Eine explorative Studie über deren Zusammenhang",
    author = "Matthias {Barkhausen}",
    year = "1997",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832400231",
    url = "https://m.diplom.de/document/215982"
}