APA-čujuhus (7. p.)

Leedy, P. D. (1985). Practical research: Planning and design (3rd ed.). Macmillan.

Chicago-čujuhus (17. p.)

Leedy, Paul D. Practical Research: Planning and Design. 3rd ed. New York: Macmillan, 1985.

MLA-čujuhus (9. p.)

Leedy, Paul D. Practical Research: Planning and Design. 3rd ed. Macmillan, 1985.

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