Demiris, G., Oliver, D. P., & Washington, K. T. (2019). Defining and analyzing the problem. Behavioral Intervention Research in Hospice and Palliative care: Building an Evidence Base, 27-39.
Obileye, A. A., & Aborisade, R. (2020). Social problem. In T. Olorunlana, F. R. Tinuola & O. O. Fasoranti, Introduction to sociology: African culture, context and complexity (pp. 275-285). Igbinedion University