Powell, A. A. (1974). Empirical analytics of demand systems. Lexington Books.
Lua i Stíl Chicago (17ú heag.)Powell, Alan A. Empirical Analytics of Demand Systems. Lexington, Mass.: Lexington Books, 1974.
Lua MLA (8ú heag.)Powell, Alan A. Empirical Analytics of Demand Systems. Lexington Books, 1974.
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