Gaya APA
Shadish, W, R. et al (2002).
Experimental and Quasi-Experimental Design for Generalized Causal Inference .
Boston:
Houghto Mifflin.
Gaya MLA
Shadish, William, R.. et al.
"Experimental and Quasi-Experimental Design for Generalized Causal Inference".
Boston:
Houghto Mifflin,
2002.
Text.