1.
Simangunsong EH, Pasaribu AN, Sembiring RA. Directive and Commissive Speech in Roald Dahl Novel: The Umbrella Man. JPDK [Internet]. 2022 Oct. 6 [cited 2025 Dec. 5];4(5):4265-76. Available from: https://journal.universitaspahlawan.ac.id/index.php/jpdk/article/view/7295