@book { DerMatthusEffektimprofessionellenFuballinDeutschlandVomTalentzumProfisportler,
    title = "Der Matthäus-Effekt im professionellen Fußball in Deutschland: Vom Talent zum Profisportler",
    author = "Andreas {Lehmann}",
    year = "2015",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/297091"
}