Morales, J. O. (1943). A credit study of 167 tobacco farms, Puerto Rico, 1939-40.
Lua i Stíl Chicago (17ú heag.)Morales, Julio O. A Credit Study of 167 Tobacco Farms, Puerto Rico, 1939-40. [Ithaca, N.Y.], 1943.
Lua MLA (8ú heag.)Morales, Julio O. A Credit Study of 167 Tobacco Farms, Puerto Rico, 1939-40. 1943.
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