Jibasen, D, AC Haruna, and IR Yamusa. 2020. “Estimating the Proportion of Alcohol, Illicit Substance and Drug Users and Impacts on Project Performance in Construction Sites in Adamawa and Taraba State, North Eastern Nigeria”. NIGERIAN ANNALS OF PURE AND APPLIED SCIENCES 3 (3b):197-207. https://doi.org/10.46912/napas.208.