Agumba, Justus N., and Theo Haupt. “Validating and Identifying Health and Safety Performance Improvement Indicators: Experience of Using Delphi Technique”. Journal of Economics and Behavioral Studies 7, no. 3(J) (June 30, 2015): 14–22. Accessed October 25, 2026. https://amhinternational.com/jebs/article/view/2723-validating-and-identifying-health-and-safety-performance-improvement-indicators-experience-of-using-delphi-technique.