Widya SO, Wahyuni I. The Correlation Between Grammar Mastery and Writing Thesis Proposal at STKIP YDB Lubuk Alung. Arbitrer [Internet]. 2018 Oct. 29 [cited 2026 Mar. 19];5(2):75-80. Available from: https://arbitrer.fib.unand.ac.id/index.php/arbitrer/article/view/114