Ault, D. E. (1969). The determinants of world steel exports: An empirical study. New York: University Microfilms International.
Trích dẫn kiểu ChicagoAult, David Earl. The Determinants of World Steel Exports: An Empirical Study. New York: University Microfilms International, 1969.
Deismireacht MLAAult, David Earl. The Determinants of World Steel Exports: An Empirical Study. New York: University Microfilms International, 1969.
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