【作者(必填)】Dunning, Thad

【文题(必填)】

Improving Causal Inference

:

Strengths and Limitations of Natural Experiments

【年份(必填)】2008

【全文链接或数据库名称(选填)】Political Research Quarterlyhttp://web.ebscohost.com/ehost/detail?sid=bd2e2057-67b6-4adc-86f4-c447d0fdac01%40sessionmgr13&vid=1&hid=22&bdata=Jmxhbmc9emgtY24mc2l0ZT1laG9zdC1saXZl#db=aph&AN=32432708