Lua APA (7ú heag.)

Donald Cooper. (2019). Business Reserarch Methods (12th ed.). McGraw Hill.

Lua i Stíl Chicago (17ú heag.)

Donald Cooper. Business Reserarch Methods. 12th ed. Delhi: McGraw Hill, 2019.

Lua MLA (9ú heag.)

Donald Cooper. Business Reserarch Methods. 12th ed. McGraw Hill, 2019.

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