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APA Citation
Bai, H., & Clark, M. H. (. H. (2018). Propensity score methods and applications. Thousand Oaks : SAGE Publications, Inc. http://access.bl.uk/ark:/81055/vdc_100071082212.0x000001
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Bai, H., & Clark, M. H. (. H. (2018). Propensity score methods and applications. Thousand Oaks : SAGE Publications, Inc. http://access.bl.uk/ark:/81055/vdc_100071082212.0x000001