Travis, W. P. (1964). The theory of trade and protection. Harvard Univ..
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Dyfyniad Arddull Chicago
Travis, William Penfield. The Theory of Trade and Protection. Cambridge: Harvard Univ., 1964.
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Dyfyniad MLA
Travis, William Penfield. The Theory of Trade and Protection. Harvard Univ., 1964.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.