Edmonds, A. & Kennedy T. D. (2017). An applied guide to research designs: Quantitative, qualitative, and mixed methods, Second Edition. Thousand Oaks, California: SAGE Publications, Inc.
Mertens, D., Holmes, H., & Harris, R. (2009). Transformative research and ethics. In D. M. Mertens & P. E. Ginsberg, The handbook of social research ethics. Thousand Oaks, CA: SAGE Publications, Inc.