@book { Machsieglcklich,
    title = "Mach sie glücklich",
    author = "Marcie {Mai}",
    year = "2012",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    doi = "10.3239/9783943835397",
    url = "https://m.dotbooks.de/document/196013"
}