Dirisu, Joy I., Oluwole Iyiola, and O. S. Ibidunni. 2013. “PRODUCT DIFFERENTIATION: A TOOL OF COMPETITIVE ADVANTAGE AND OPTIMAL ORGANIZATIONAL PERFORMANCE (A STUDY OF UNILEVER NIGERIA PLC)”. European Scientific Journal, ESJ 9 (34). https://doi.org/10.19044/esj.2013.v9n34p%p.