Heltberg, Leif. “Tibor Barna (Editor): The Structural Interdependence the Economy. New York and Milano 1956. Pris 7,50 $. VIII + 429 Sider”. Nationaløkonomisk tidsskrift 95 (January 1, 1957). Accessed November 6, 2026. https://tidsskrift.dk/nationaloekonomisktidsskrift/article/view/60793.