https://www.univ-msila.dz/fr/multimed...UI%20SARA).pdf 20M%C3%A9moires%20de%20magist%C3%A9re/M%C3%A9moires%20Lettres/M%C3%A9moire(ZAOUI%20SARA).pdf https://soufaouraktakhafia.maktoobblo...-%D8%A5%D8%A8/