Christensen, L. B. (2001). Experimental methodology (3rd. ed.). Allyn & Bacon.
Lua i Stíl Chicago (17ú heag.)Christensen, Larry B. Experimental Methodology. 3rd. ed. Boston: Allyn & Bacon, 2001.
Lua MLA (9ú heag.)Christensen, Larry B. Experimental Methodology. 3rd. ed. Allyn & Bacon, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.