Ellsworth, P. T., & Leith, J. C. (1975). The international economy (5th ed.). Macmillan.
Lua i Stíl Chicago (17ú heag.)Ellsworth, Paul Theodore, agus James Clark Leith. The International Economy. 5th ed. New York: Macmillan, 1975.
Lua MLA (9ú heag.)Ellsworth, Paul Theodore, agus James Clark Leith. The International Economy. 5th ed. Macmillan, 1975.
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