COOPER, D. R. Business research methods#Donald R. Cooper, Pamela S. Schindler. McGrow-Hill.
Lua i Stíl Chicago (17ú heag.)COOPER, Donald R. Business Research Methods#Donald R. Cooper, Pamela S. Schindler. McGrow-Hill.
Lua MLA (8ú heag.)COOPER, Donald R. Business Research Methods#Donald R. Cooper, Pamela S. Schindler. McGrow-Hill.
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