Ibrahim, Muhammad Hasan. Grammatical gender : its origin and development / by Muhammad Hasan Ibrahim. - The Hague : Mouton, 1973. - 113 p. ; 23 cm. - Janua linguarum. Series minor ; vol. 166. . - Janua linguarum. Series minor ; vol. 166. . Bibliography : p. (105)-109. Subjects--Topical Terms: Grammar, Comparative and general--Gender.