DOUGLAS, E. J. (1992). Managerial Economics Analysis And Strategy Evan J. Douglas. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)DOUGLAS, Evan J. Managerial Economics Analysis And Strategy Evan J. Douglas. Prentice-Hall, 1992.
Lua MLA (8ú heag.)DOUGLAS, Evan J. Managerial Economics Analysis And Strategy Evan J. Douglas. Prentice-Hall, 1992.
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