@book { ZumVerstndnisvonseelischerGesundheit,
    title = "Zum Verständnis von seelischer Gesundheit",
    subtitle = "The Humanist Concept of Mental Health",
    author = "Erich {Fromm} and Rainer {Funk}",
    year = "2015",
    publisher = "Edition Erich Fromm",
    address = "München, Deutschland",
    url = "https://books.openpublishing.com/document/310079"
}