Unpacking Black Boxes: Mechanisms and Theory Building in Evaluation
Author: Astbury, Brad.  Published in: American Journal of Evaluation, v. 31  no. 3, pp. 363- 381  Date: 2010
ISSN:  1098-2140,  EISSN:  1557-0878  DOI:  10.1177/1098214010371972 
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