@book { TheoriederGenossenschaft,
    title = "Theorie der Genossenschaft",
    subtitle = "Eine industrieökonomische Analyse",
    author = "Michael {Higl}",
    year = "2008",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1103859"
}