A. H. O. A. A. Omer and E. M. A. ElSiddig, “Morphological Terms in the Textbooks of Morphology: A study of their concepts Overlapping and Forms substitution”, AJSRP, vol. 5, no. 3, pp. 25–1, Sep. 2019, doi: 10.26389/AJSRP.A180619.