P. Sveistrup, P. (1940) “Koopmans, T.: TANKER FREIGHT RATES AND TANKSHIP BUILDING. An Analyses cyclical fluctuations. Haarlem & London 1939”., Nationaløkonomisk Tidsskrift, 3. Tilgængelig hos: https://tidsskrift.dk/nationaloekonomisktidsskrift/article/view/60080 (Set: 5 december 2025).