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![Cover for Apollo M. Nkwake · Credibility, Validity, and Assumptions in Program Evaluation Methodology (Paperback Book) [Softcover reprint of the original 1st ed. 2015 edition] (2016)](https://imusic.b-cdn.net/images/item/original/645/9783319344645.jpg?apollo-m-nkwake-2016-credibility-validity-and-assumptions-in-program-evaluation-methodology-paperback-book&class=scaled&v=1604029426)
![Cover for Apollo M. Nkwake · Credibility, Validity, and Assumptions in Program Evaluation Methodology (Hardcover Book) [1st ed. 2015 edition] (2015)](https://imusic.b-cdn.net/images/item/original/204/9783319190204.jpg?apollo-m-nkwake-2015-credibility-validity-and-assumptions-in-program-evaluation-methodology-hardcover-book&class=scaled&v=1539935119)