@book { DieKunstdesLiebens,
    title = "Die Kunst des Liebens",
    author = "Erich {Fromm} and Rainer {Funk}",
    year = "2014",
    publisher = "Edition Erich Fromm",
    address = "München, Deutschland",
    url = "https://books.openpublishing.com/document/286085"
}