Okafor Okechukwu Sunday และ Apitep Saekow. (2014) Analysis of the relationship between relationship marketing and customer retention in Nigerian banking industry. Stamford international university:ม.ป.ท.Okafor Okechukwu Sunday และ Apitep Saekow. 2014. Analysis of the relationship between relationship marketing and customer retention in Nigerian banking industry. ม.ป.ท.:Stamford international university;Okafor Okechukwu Sunday และ Apitep Saekow. Analysis of the relationship between relationship marketing and customer retention in Nigerian banking industry. ม.ป.ท.:Stamford international university, 2014. Print.