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Lua i Stíl Chicago (17ú heag.)taha, hamdy a. An Optimal Policy for Machine Tool Replacement. cairo: the institute of national planning, 1964.
Lua MLA (9ú heag.)taha, hamdy a. An Optimal Policy for Machine Tool Replacement. the institute of national planning, 1964.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.