Vethamani, M. E., U. K. A. Manaf, and O. Akbari. “ESL LEARNERS’ USE OF ENGLISH MODALS IN NARRATIVE COMPOSITIONS: SYNTATIC AND SEMANTIC ACCURACY”. TEFLIN Journal, vol. 19, no. 2, Aug. 2008, pp. 141-59, doi:10.15639/teflinjournal.v19i2/141-159.