1. American Psychological Association. (2017). Ethical Principles of Psychologists and Code of Conduct. Washington: APA.
2. Atuobi, S. M. (2007). Corruption and state instability in West Africa: An examination of policy options (KAIPTC Occasional Paper No. 21).https://media.africaportal.org/documents/CORRUPTION_AND_STATE_INSTABILITY.pdf
3. Baker, S. E. and Edwards, R. (eds) (2012). How Many Qualitative Interviews Is Enough? Expert Voices and Early Career Reflections on Sampling and Cases in Qualitative Research, National Centre for Research Methods Review Paper. Online publication accessed 15.3.2021: http://eprints.ncrm.ac.uk/2273/4/how_many_interviews.pdf