@book { DerMinderjhrigeimSport,
    title = "Der Minderjährige im Sport",
    author = "Stephanie Beatrice {Pfaff}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b14642",
    url = "https://www.peterlang.com/document/1057156"
}