Leedy, P. D. (1993). Practical research: Planning and design (5th ed.). Prentice Hall.
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Chicago-čujuhus (17. p.)
Leedy, Paul D. Practical Research: Planning and Design. 5th ed. New Jersey: Prentice Hall, 1993.
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MLA-čujuhus (9. p.)
Leedy, Paul D. Practical Research: Planning and Design. 5th ed. Prentice Hall, 1993.
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