OZOEMENA, C. C., O. M. OYEKU, and T. M. OKONKWO. “SIX SIGMA AND PERFORMANCE OF SMALL SCALE MANUFACTURING FIRMS IN ABUJA”. JOURNAL OF ECONOMICS AND ALLIED RESEARCH, vol. 10, no. 2, July 2025, pp. 243-6, http://jearecons.com/index.php/jearecons/article/view/554.