Sitorus, N., E. F. Y. Siregar, B. A. Siagian, F. D. Lestari, and H. Silitonga. “Investigating and Examining the Structure and the Difficulties of Tertiary Learners in Essay Writing: Rhetorically-Based Approach”. Linguistics and Culture Review, vol. 5, no. S3, Dec. 2021, pp. 1704-13, doi:10.21744/lingcure.v5nS3.1953.