Walker, F. A. (1893). First lessons in political economy. Henry Holt and Co..
Lua i Stíl Chicago (17ú heag.)Walker, Francis Amasa. First Lessons in Political Economy. New York: Henry Holt and Co., 1893.
Lua MLA (8ú heag.)Walker, Francis Amasa. First Lessons in Political Economy. Henry Holt and Co., 1893.
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