@book { LebensfreudeimAlterbitte,
    title = "Lebensfreude im Alter, bitte!",
    subtitle = "Wie uns die Weisheit der Senioren leiten kann",
    author = "Barbara Yaga {Mierzwa}",
    year = "2016",
    publisher = "Omnino Verlag",
    address = "Berlin, Deutschland",
    url = "https://shop.omnino-verlag.de/document/322291"
}