@book { ElementareMethodikdesZielundZeitmanagements,
    title = "Elementare Methodik des Ziel- und Zeitmanagements",
    author = "Marcus {Tietz}",
    year = "2018",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/443009"
}