Comments on Levin et al. and Rosen and Kopel: Internal and external validity issues.
- 1 January 1978
- journal article
- Published by American Psychological Association (APA) in Journal of Consulting and Clinical Psychology
- Vol. 46 (6) , 1515-1516
- https://doi.org/10.1037//0022-006x.46.6.1515
Abstract
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