Su'alat Abi'Ubayd al-Ajurri lil-Imam Abi Da'ud Sulayman ibn al-Ash'ath al-Sijistani 202-275 H, fi ma'rifat al-rijal wa-jarhihim wa-ta'dilihim - Abu Da'ud Sulayman ibn al-Ash'ath al-Sijistani, 817 or 18-889; al-Azhari, Abu'Umar Muhammad ibn'Ali; al-Ajurri, Abu'Ubayd Allah Muhammad ibn'Ali (al-Qahirah : al-Faruq al-Hadithiyah, 2010)
Keywords: Hadith -- Authorities -- Early works to 1800; Hadith -- Criticism, interpretation, etc. -- Early works to 1800