Turki, Hutheifa Y., et al. “A Cross-Sectional Study of Refusal Speech Act Used by Iraqi Undergraduate Students: Of English in Relation to the Academic Level”. KOYA UNIVERSITY JOURNAL OF HUMANITIES AND SOCIAL SCIENCES, vol. 3, no. 1, June 2020, pp. 166-73, doi:10.14500/kujhss.v3n1y2020.pp166-173.