Ma'mūn, al-khalīfah al-'ālim.
Series: Aʻlām al-ʻArab -- 59
Publisher: Al-Dār al-Miṣrīyah lil tā'līf wa-al-tarjamah
Published: 1966
Place of publication: Al-Qāhirah
Language: ara
Number of pages: 175
Subjects: Maʾmūn, -- Caliph, -- 786-833.