Research Methodology: Strengthening Causal Interpretations of Nonexperimental Data: Conference Proceedings
Sechrest, Lee B.
and Bunker, John
Rockville, MD: U.S. Department of Health and Human Services, Public Health Service, Agency for Health Care Policy and Research; Springfield, VA: Available from N.T.I.S., . 230 p.
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Ver Ploeg, Michele and Perrin, Edward (National Research Council (United States). Panel on DHHA Collection of Race and Ethnicity Data, 2004)
Melnick, Daniel and Perrin, Edward (National Research Council [NRC] (United States). Panel on DHHS Collection of Race and Ethnicity Data, 2004)