@book { MarxBeitragzumWissenvomMenschen,
    title = "Marx’ Beitrag zum Wissen vom Menschen",
    subtitle = "Marx’s Contribution to the Knowledge of Man",
    author = "Erich {Fromm} and Rainer {Funk}",
    year = "2015",
    publisher = "Edition Erich Fromm",
    address = "München, Deutschland",
    url = "https://books.openpublishing.com/document/303756"
}