ArmstrongM., P. R. (2007). Handbook of Industrial Organization. ELSEVIER.
Lua i Stíl Chicago (17ú heag.)ArmstrongM., Porter R. Handbook of Industrial Organization. ELSEVIER, 2007.
Lua MLA (8ú heag.)ArmstrongM., Porter R. Handbook of Industrial Organization. ELSEVIER, 2007.
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