El-Kilani, S.Z. et al. 2013. THE DYNAMIC TRANSITION FROM LIMITED ENGLISH PROFICIENCY INTO ENGLISH PROFICIENCY IN ASSESSING UNIVERSITY STUDENTS’ UNDERSTANDING OF CHEMISTRY CONCEPTS. European Scientific Journal, ESJ. 9, 19 (Jul. 2013). DOI:https://doi.org/10.19044/esj.2013.v9n19p%p.