↑ Brewer, M (2000). Reis, H; Judd, C, eds. Research Design and Issues of Validity. Handbook of Research Methods in Social and Personality Psychology. Cambridge: Cambridge University Press.CS1 maint: Uses editors parameter (link)
1 2 Shadish, W; Cook, T; Campbell, D. (2002). Experimental and Quasi-Experimental Designs for Generilized Causal Inference. Boston: Houghton Mifflin.CS1 maint: Uses authors parameter (link)
↑ Levine, G; Parkinson, S (1994). Experimental Methods in Psychology. Hillsdale, NJ: Lawrence Erlbaum.
↑ Liebert, RM; Liebert, LL (1995). Science and behavior: An introduction to methods of psychological research. Englewood Cliffs, NJ: Prentice Hall.CS1 maint: Multiple names: authors list (link)
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