Ukoh EE. DETERMINING THE EFFECT OF PROBLEM-BASED LEARNING INSTRUCTIONAL STRATEGY ON NCE PRE-SERVICE TEACHERS’ ACHIEVEMENT IN PHYSICS AND ACQUISITION OF SCIENCE PROCESS SKILLS. ESJ [Internet]. 2012 Aug. 29 [cited 2026 Feb. 2];8(17). Available from: https://last.eujournal.org/index.php/esj/article/view/271