Christensen, L. B. (2001). Experimental methodology (Eight edition.). Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)Christensen, Larry B. Experimental Methodology. Eight edition. Boston: Allyn and Bacon, 2001.
Lua MLA (8ú heag.)Christensen, Larry B. Experimental Methodology. Eight edition. Allyn and Bacon, 2001.
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