@book { MundartwandelimmittlerenAargau,
    title = "Mundartwandel im mittleren Aargau",
    author = "Niklaus {Bigler}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1070687"
}