F. ur Rehman, F. Javed, T. Nawaz, I. Ahmed, and S. Hyder, “Some Insights in the Historical Prospective of Hierarchy of Effects Model: A Short Review”, IMBR, vol. 6, no. 6, pp. 301–308, Dec. 2014, doi: 10.22610/imbr.v6i6.1128.