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1par Baldwin Robert E., Pearson Charles S., Balassa Bela A., Corden Warner Max, Krueger Anne Osborn, Grilli Enzo Romano, Riedel James A., Takacs Wendy E.
Basil Blackwell 1990Livre -
2Rand Mc Nally 1966Livre
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3University of Chicago Press c1988Livre
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4B. Blackwell 1989Livre