This is a list of significant books in the doctrines of Sunni Islam. A classical example of an index of Islamic books can be found in Kitāb al-Fihrist of Ibn Al-Nadim.
The most authoritative collections of Hadith are called The Six Books. However, the sixth place is disputed with some scholars preferring the Al-Muwatta, hence there are seven books listed here.
These were compiled from the primary collections.