Hertel Wulff, N. (1903) “T. H. FARRER. The state in its relation to trade. With supplementary chapter by SIR ROBERT GIFFEN. London 1902. Macmillan & Co. (208 S.)”., Nationaløkonomisk Tidsskrift, 3. Tilgængelig hos: https://tidsskrift.dk/nationaloekonomisktidsskrift/article/view/58400 (Set: 6 december 2025).