P. Sveistrup, P. 1957. “U.S. Department of Commerce: Transportation Factors in the Marketing of Newsprint. Transportation Nr. 2. 1953. 126 S. Pris 40 Cents”. Nationaløkonomisk Tidsskrift 95 (januar). https://tidsskrift.dk/nationaloekonomisktidsskrift/article/view/60795.