Cullen, A. E., and C. L. S. Coryn. “Forms and Functions of Participatory Evaluation in International Development: A Review of the Empirical and Theoretical Literature”. Journal of MultiDisciplinary Evaluation, vol. 7, no. 16, May 2011, pp. 32-47, https://journals.sfu.ca/jmde/index.php/jmde_1/article/view/288.