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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Unknown author (1979)
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)