Bertil Ohlin. Interregional and International Trade (Cambridge: Harvard University Press, 1957). P. 35-50; Eli Heckscher. «The Effect of Foreign Trade on the Distribution of Income», in Readings in the Theory of International Trade (Homewood IL: Irwin, 1950). P. 272- 300. Наиболее краткую формулировку их теоремы см.: Ohlin. P. 35; Heckscher. P. 287.