Redaktionen, .-. (1895) “Progressiv Beskatning. Edwin R. A. Seligmann (Professor of Political Economy and Finance, Columbia College): Progressive Taxation in Theory and Practice. [Publications of the American Economic Association]. 1894. (222 Sider) (1 Dollar)”., Nationaløkonomisk Tidsskrift, 3. Tilgængelig hos: https://tidsskrift.dk/nationaloekonomisktidsskrift/article/view/57691 (Set: 5 december 2025).