Haj Nayef, S., and M. A. AL-Hamadani. “"Ṭūbā" In the Holy Qur’an: A Linguistic, Grammatical, Morphological, and Semantic Study”. KnE Social Sciences, Vol. 8, no. 6, Mar. 2023, pp. 1027–1047, doi:10.18502/kss.v8i6.13156.