@book { MeisterschaftdesLebens,
    title = "Meisterschaft des Lebens",
    author = "Prentice {Mulford}",
    year = "2012",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    doi = "10.3239/9783955200282",
    url = "https://m.dotbooks.de/document/201910"
}