Onditi, Arvinlucy. “Implications of Customer Service on Customer Life Time Value in Tourism Sector in Kisumu County, Kenya”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 17, no. 1, July 2014, pp. 236-58, https://www.gssrr.org/JournalOfBasicAndApplied/article/view/2401.