ابن حجر العسقلاني
Khatib al-Baghdadi recommended 40 books of his for study. Most of his works have however perished even though he made an effort to preserve them by leaving his house and library in Nishapur as a Waqf for the transmission of his books. His Tarikh al-Thikat, a work of Ilm al-Rijal, was utilised by hadith critics such as al-Dhahabi, Ibn Hajar al-Asqalani etc.