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APA-čujuhus (7. p.)
Leedy, P. D. (1993). Practical research: Planning and design (5th ed.). Macmillan publishing company.
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Chicago-čujuhus (17. p.)
Leedy, Paul D. Practical Research: Planning and Design. 5th ed. New York: Macmillan publishing company, 1993.
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MLA-čujuhus (9. p.)
Leedy, Paul D. Practical Research: Planning and Design. 5th ed. Macmillan publishing company, 1993.
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