Leftwich, R. H. (1960). The price system and resource allocation. Holt, Rinehart and Winston.
Lua i Stíl Chicago (17ú heag.)Leftwich, Richard H. The Price System and Resource Allocation. Nueva York: Holt, Rinehart and Winston, 1960.
Lua MLA (9ú heag.)Leftwich, Richard H. The Price System and Resource Allocation. Holt, Rinehart and Winston, 1960.
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