Casas, François R.; Choi, Eun K. (1985). “The Metzler Paradox and the Non-equivalence of Tariffs and Quotas: Further Results”. Journal of Economic Studies12 (5): 53–57. doi:10.1108/eb002612.
de Haan, Werner A.; Visser, Patrice (December 1979). “A note on tariffs, quotas, and the Metzler Paradox: An alternative approach”. Weltwirtschaftliches Archiv115 (4): 736–741. doi:10.1007/bf02696743.
Metzler, Lloyd A. (1949). “Tariffs, the Terms of Trade, and the Distribution of National Income”. Journal of Political Economy57 (1): 1–29. doi:10.1086/256766.