@book { DasTransfersystemimLizenzfuball,
    title = "Das Transfersystem im Lizenzfußball",
    author = "Nathalie {Oberthür}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1094244"
}