@book { DerWillezumLeben,
    title = "Der Wille zum Leben",
    subtitle = "The Will to Live",
    author = "Erich {Fromm} and Rainer {Funk}",
    year = "2016",
    publisher = "Edition Erich Fromm",
    address = "München, Deutschland",
    url = "https://books.openpublishing.com/document/314003"
}