The following are from the most significant books written upon this method:

1) ‘Risaalah Al-Karkhi Fee Usool’ authored by Abu l-Hasan ‘Ubaidulah Bin Al-Hasan Al-Karkhi who passed away in the year 340 AH. In it he mentioned the Usool upon which a large number of the books of the followers of Al-Imaam Abu Haneefah revolve around. 2) ‘Usool Al-Jassaas’ written by Abu Bakr Ahmad Bin ‘Ali Ar-Raaziy Al-Jassaas Al-Hanafiy who passed away in the year 370 AH. He proceeded in his book upon the Tareeqah of Al-Karkhiy.

3) ‘Usool As-Sarkhasiy’ written by Abu Bakr Muhammad Bin Ahmad As-Sarkhasiy who passed away in the year 483 AH.

Some of the other books in Usool ul-Fiqh upon this Tareeqah include:

1) ‘Usool Al-Bazdawiy’ authored by Fakhr-ul-Islaam Abu-l-Hasan Al Bazdawiy who passed away in the year 482 AH and the name of the book is: ‘Kanz ul-Wasool Ilaa Ma’rifat ul-Usool’.

2) ‘Ta’sees An-Nazhar’ written by Abu Zaid Abdullah Ad-Daboosiy who passed away in the year 430 AH. His book guides towards the Usool that the A’immah (Imaams) of the Hanafiy Madh’hab agreed with others upon and he also mentioned where they disagreed.

3) ‘Manaar Al-Anwaar’ authored by Abu-l-Barakaat Abdullah An Nasafiy who passed away in the year 710 AH. Many explanations (Shurooh) have been written for this book and the first of which was ‘Kashf Al-Asraar’ by the same author.