Lua APA (7ú heag.)

COOPER DONALD R. (2009). BUSINESS RESEARCH METHODS [WITH CD]. TATA MCGRAW-HILL PUBLISHING COMPANY LIMITED.

Lua i Stíl Chicago (17ú heag.)

COOPER DONALD R. BUSINESS RESEARCH METHODS [WITH CD]. NEW DEHLI: TATA MCGRAW-HILL PUBLISHING COMPANY LIMITED, 2009.

Lua MLA (9ú heag.)

COOPER DONALD R. BUSINESS RESEARCH METHODS [WITH CD]. TATA MCGRAW-HILL PUBLISHING COMPANY LIMITED, 2009.

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