BARNOW, BS, GG CAIN, and AS GOLDBERGER (1980): "Issues in the Analysis of Selectivity Bias," Evaluation Studies Review Annual: Volume 5, 43.

题名：Issues in the Analysis of Selectivity Bias
作者：BARNOW, BS, GG CAIN, and AS GOLDBERGER
期刊全称或缩写：Evaluation Studies Review Annual
年份，卷（期），起止页码： 1980, Volume 5, 43.

BARNOW, BS, G CAIN, and A GOLDBERGER (1981): "Selection on Observables," Evaluation Studies Review Annual, 5, 43-59.

题名：Selection on Observables
作者：BARNOW, BS, GG CAIN, and AS GOLDBERGER
期刊全称或缩写：Evaluation Studies Review Annual
年份，卷（期），起止页码： 1980, Volume 5, 43-59.

这两篇有可能是同一篇，各处引用的标题和年份都不同，非常感谢各位的帮助！

[此贴子已经被作者于2009-5-31 13:30:18编辑过]