@book { FokusaufLernerstrategien,
    title = "Fokus auf Lernerstrategien",
    author = "Jana {Oldendörp}",
    year = "2022",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b19499",
    url = "https://www.peterlang.com/document/1246365"
}