【作者(必填)】E. M. Glaser, T. E. Backer and M. N. Evaluation Minneapolis

【文题(必填)】LOOK AT PARTICIPANT-OBSERVATION

【年份(必填)】Eval 1:46-49,1973

【全文链接或数据库名称(选填)】https://www.ncjrs.gov/App/abstractdb/AbstractDBDetails.aspx?id=39424