Kassim, Asma, Salama Yusuf, Abdalla Ussi, and Moza Omar. “Impact of Zanzibar Investment Promotion Authority Approved Projects on Gross Domestic Product of Zanzibar”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 56, no. 2 (March 23, 2021): 253–262. Accessed April 19, 2024. https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/12267.