Vethake, H. (1838). The principles of political economy. P. H. Nicklin & T. Johnson.
Lua i Stíl Chicago (17ú heag.)Vethake, Henry. The Principles of Political Economy. Philadelphia: P. H. Nicklin & T. Johnson, 1838.
Lua MLA (8ú heag.)Vethake, Henry. The Principles of Political Economy. P. H. Nicklin & T. Johnson, 1838.
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