Daffay, M. ., and S. S. . Ali. “Labour Productivity and Money Demand Behavior in Zanzibar”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 55, no. 1, Jan. 2021, pp. 201-10, https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/12146.