Source: https://www.researchgate.net/profile/Titus-Eze/publication/340621763_Effects_of_Problem-based_Teaching_method_on_Students'_Academic_Performance_in_Electrical_Installation_and_Maintenance_Works_in_Technical_Colleges/links/5e95aa8a4585150839db16dd/Effects-of-Problem-based-Teaching-method-on-Students-Academic-Performance-in-Electrical-Installation-and-Maintenance-Works-in-Technical-Colleges.pdf