al-Baḥṯ al-luġawī ʿinda ʾl-ʿarab maʿa dirāsa li-qaḍīyat at-taʾṯīr wa-ʾt-taʾaṯṯur - ʿUmar, Aḥmad Muḫtār (Dār al-Maʿārif bi-Miṣr, 1971)