APA-čujuhus (7. p.)

Leedy Paul D. (2001). Practical Research Planning and Design. Merrill Prentice Hall.

Chicago-čujuhus (17. p.)

Leedy Paul D. Practical Research Planning and Design. MPH: Merrill Prentice Hall, 2001.

MLA-čujuhus (9. p.)

Leedy Paul D. Practical Research Planning and Design. Merrill Prentice Hall, 2001.

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