W. . . Alhakimi, Y. Q. A. . . Musleh, and R. A. . . Qahtan, “Internal Marketing and it’s impact in achieving competitive advantage‘ Applicable at Private Universities in Taiz’”, hesj, vol. 7, no. 16, pp. 399–429, May 2021, doi: 10.55074/hesj.v7i16.284.