Saboe, A., H. A. . Machmoed, and N. J. Saleh. “Requesting Strategies in The Doorman Movie Using the Trosbrog’s Theory (1995)”. ELS Journal on Interdisciplinary Studies in Humanities, vol. 5, no. 1, Mar. 2022, pp. 70-76, doi:10.34050/elsjish.v5i1.19889.