Kitaab al-Eemaan - al-Qaadee Abi Ya'laa (458H)

Written by the great scholar al-Hanbali Abu Qady Ya'la on al-Iman and topics related to it, among other related words of Imam Ahmad on the topic. This book is basically a thesis of Magisterium presented to the University of Medina in Aqeedah section, the book thus enjoys a long and interesting upstream research.