Phillips, W. (1850). Propositions concerning protection and free trade. C. C. Little and J. Brown.
Lua i Stíl Chicago (17ú heag.)Phillips, Willard. Propositions Concerning Protection and Free Trade. Boston: C. C. Little and J. Brown, 1850.
Lua MLA (8ú heag.)Phillips, Willard. Propositions Concerning Protection and Free Trade. C. C. Little and J. Brown, 1850.
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