@book { Doingpeergroup,
    title = "«Doing peer-group»",
    subtitle = "Die interaktive Konstitution jugendlicher Gruppenpraxis",
    author = "Axel {Schmidt}",
    year = "2004",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1098145"
}