@book { DankeThankyouMerci,
    title = "«Danke! Thank you! Merci!»",
    subtitle = "Die Pilgerbücher der Wallfahrtskirche Mariatrost bei Graz",
    author = "Gabriele {Ponisch}",
    year = "2001",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1091695"
}