LEIDER, R. D. (1968). Modern Economics Robert D Leider. Barnes & Noble.
Lua i Stíl Chicago (17ú heag.)LEIDER, Robert D. Modern Economics Robert D Leider. Barnes & Noble, 1968.
Lua MLA (8ú heag.)LEIDER, Robert D. Modern Economics Robert D Leider. Barnes & Noble, 1968.
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