Nwoke, B. I., P. O. Uzoma, and A. C. Akukwe. 2014. “Effect of Mastery Learning Strategy on Mathematics Achievement of Senior Secondary School Students in Ngor-Okpala Local Government Area of Imo State, Nigeria”. International Journal of Natural and Practical Sciences (IJNPS) 2 (2):35-40. http://icidr.org.ng/index.php/Ijnps/article/view/526.