علي خير صابر و حافظ ابوبكر امحمد و نوارة محمد الفيتوري 2019. Using Statistical Quality Control Charts for Measuring Educational Service Quality at Sebha University from the Viewpoint of Students. Journal of Pure & Applied Sciences . 18, 4 (Nov. 2019). DOI:https://doi.org/10.51984/jopas.v18i4.432.