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	1.	Image from Amazon.com	A primer on regression artifacts by Campbell, Donald T Kenny, David A Series: Methodology in the social sciences Material type: Text Publication details: New York Guilford Pr 1999 Availability: Items available for loan: IGIDR (1)Collection, call number: 519.536/CAM. Found in Open Library: Place hold Save to lists
	2.	Image from Amazon.com	Experimental and quasi-experimental designs for generalized by Shadish, WIlliam R Campbell Donald T Cook Thomas D Material type: Text Publication details: Belmont Wadsworth Cengage Learning 2002 Availability: Items available for loan: IGIDR (1)Collection, call number: 519.5/SHA . Found in Open Library: Place hold Save to lists

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