Cooper, D. R., & Emory, C. W. (1995). Business Research Methods (5th ed.). Irwin.
Chicago-čujuhus (17. p.)Cooper, Donald R., juo C. William Emory. Business Research Methods. 5th ed. Chicago: Irwin, 1995.
MLA-čujuhus (9. p.)Cooper, Donald R., juo C. William Emory. Business Research Methods. 5th ed. Irwin, 1995.
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