Agumba, Justus N., and I. Musonda. “Perception of the Effects of Substance Abuse Among University Students: A Case of Built Environment and Civil Engineering Students at a South African University in Gauteng Province”. Journal of Economics and Behavioral Studies, vol. 7, no. 4(J), Aug. 2015, pp. 82-89, https://doi.org/10.22610/jebs.v7i4(J).596.