@book { ZurTheorieundStrategiedesFriedens,
    title = "Zur Theorie und Strategie des Friedens",
    author = "Erich {Fromm} and Rainer {Funk}",
    year = "2015",
    publisher = "Edition Erich Fromm",
    address = "München, Deutschland",
    url = "https://books.openpublishing.com/document/304752"
}