WAHL, S. V. Invesment appraisal and economic evaluation of mining enterprise. Gulf Publication Co.
Lua i Stíl Chicago (17ú heag.)WAHL, Siesfried Von. Invesment Appraisal and Economic Evaluation of Mining Enterprise. Gulf Publication Co.
Lua MLA (8ú heag.)WAHL, Siesfried Von. Invesment Appraisal and Economic Evaluation of Mining Enterprise. Gulf Publication Co.
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