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HARVARD Citation
Nkwake, A. (2015) Credibility, validity, and assumptions in program evaluation methodology. [Online]. Cham : Springer. Available from: http://access.bl.uk/ark:/81055/vdc_100072052934.0x000001
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Nkwake, A. (2015) Credibility, validity, and assumptions in program evaluation methodology. [Online]. Cham : Springer. Available from: http://access.bl.uk/ark:/81055/vdc_100072052934.0x000001