Francis, T., D. P. Slippe, D. A. Hayford, and M. B. Danquah. “An Analysis of Mechanics in Written Essays of Ghanaian ESL Students: A Focus on the Problems of Punctuation Marks”. The International Journal of Humanities & Social Studies, vol. 7, no. 11, Nov. 2019, doi:10.24940/theijhss/2019/v7/i11/HS1911-027.