@book { CanadainGrainauLeCanadaGrainau,
    title = "Canada in Grainau- Le Canada à Grainau",
    author = "Klaus-Dieter {Ertler} and Hartmut {Lutz}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1106960"
}