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. Tilgængelig hos: https://tidsskrift.dk/nationaloekonomisktidsskrift/article/view/60795 (Set: 5 december 2025).