@book { DieKraftderLebensvision,
    title = "Die Kraft der Lebensvision",
    subtitle = "In 9 Schritten zum Glück",
    author = "Hans {Kreis}",
    year = "2013",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    doi = "10.3239/9783955201265",
    url = "https://www.dotbooks.de/document/208166"
}