Vu, Duc Cong, et al. “An Empirical Analysis of the Prominent Roles of Taxations in the Synchronicity on Boost of Maritime Industry in Singapore”. International Journal of Economics and Financial Issues, vol. 6, no. 1, Jan. 2016, pp. 118-31, https://mail.econjournals.com/index.php/ijefi/article/view/1604.