@book { SelbstbestimmtesLerneninderSchule,
    title = "Selbstbestimmtes Lernen in der Schule",
    author = "Andrea {Pieter}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1098297"
}