Eichhorn, W. (1978). Functional equations in economics. Addison-Wesley.
Lua i Stíl Chicago (17ú heag.)Eichhorn, Wolfgang. Functional Equations in Economics. Reading, Mass: Addison-Wesley, 1978.
Lua MLA (9ú heag.)Eichhorn, Wolfgang. Functional Equations in Economics. Addison-Wesley, 1978.
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