Christensen, L. B. Experimental methodology. Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)Christensen, Larry B. Experimental Methodology. Allyn and Bacon.
Lua MLA (8ú heag.)Christensen, Larry B. Experimental Methodology. Allyn and Bacon.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.