@book { DasErstePortugiesischeLesebuchfrAnfnger,
    title = "Das Erste Portugiesische Lesebuch für Anfänger",
    author = "Elisabeth {May}",
    year = "2024",
    publisher = "Audiolego",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1452489"
}