@book { VorwortinBLubanPlozzaPraxisderBalintGruppen,
    title = "Vorwort in B. Luban-Plozza „Praxis der Balint-Gruppen“",
    author = "Erich {Fromm} and Rainer {Funk}",
    year = "2016",
    publisher = "Edition Erich Fromm",
    address = "München, Deutschland",
    url = "https://books.openpublishing.com/document/313986"
}