Loucks, W. N. (1969). Comparative economic systems (8th ed.). Harper & Row.
Lua i Stíl Chicago (17ú heag.)Loucks, William Negele. Comparative Economic Systems. 8th ed. New York: Harper & Row, 1969.
Lua MLA (9ú heag.)Loucks, William Negele. Comparative Economic Systems. 8th ed. Harper & Row, 1969.
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