فهرس المقالات public relations of organization حرية الوصول المقاله صفحة الملخص نص كامل 1 - Evaluating the Extent to which Public Relations of Private Organizations Employ Social Networks to Introduce Products and Services Alireza Biabannavard Sarvestani Helen Hedeshian 10.30495/jsm.2023.1977540.1746