T. S. Oira and M. Otieno, “Effect Of Boat Transport Mode On Cost Of Goods In Lamu Island, Kenya”, IJSBAR, vol. 9, no. 1, pp. 41–57, Oct. 2013, Accessed: Oct. 27, 2025. [Online]. Available: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/1172