Ittiḥād al-ʻĀmm lil-Udabāʼ wa-al-Kuttāb al-ʻArab, Ittiḥād al-ʻĀmm lil-Udabāʾ wa-al-Kuttāb al-ʻArab. Muʾtamar al-ʻĀmm, Rābiṭat al-Kuttāb al-Urdunīyīn