Usul Al Fiqh for the Muslim Who is not a Mujtahid by Shaykh Saad Bin Nasir Al Shithri
This is a small islamic book on Usul ul Fiqh, Commonly translated as Priciples of Islamic Law. It is perhaps the only book that has selected principles that relate directly to the Muslim whi is not a Mujtahid from the classical works of Usul ul Fiqh. Therefore, it is considered essential reading for every Muslim.