Kassim A, Yusuf S, Ussi A, Omar M. Impact of Zanzibar Investment Promotion Authority Approved Projects on Gross Domestic Product of Zanzibar. IJSBAR. 2021;56(2):253-262. Accessed January 10, 2026. https://www.gssrr.org/JournalOfBasicAndApplied/article/view/12267