@book { SystemischesLernen,
    title = "Systemisches Lernen",
    subtitle = "Individuelle und organisationale Lernprozesse in Kommunikationsarchitekturen",
    author = "Mark {Ackermann}",
    year = "2005",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1098356"
}