.Grubel, H. G. (1981). International economics. R.D. Irwin.
Tohutoru Kātū Chicago (17th ed.).Grubel, Herbert G. International Economics. Homewood, Ill.: R.D. Irwin, 1981.
Tohutoro MLA (9th ed.).Grubel, Herbert G. International Economics. R.D. Irwin, 1981.
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