Kitab At-Tawheed is one of the best books on the subject of Tawheed (Islamic Monotheism) and ranks high in authenticity. Till date it has gone through various publications; and had been the means for guidance of the millions of people throughout the world; by taking them out of the darkness of polytheism and error.
Author: Muhammad Bin Abdul Wahhab
Publisher: http://www.islambasics.com - Islam Basics Website
A discussion of the 'pillars' of Eemaan and the factors which invalidate ISlam and remove a person from its fold.
Author: Abdul Aziz bin Abdullah bin Baz
Source: http://www.islamhouse.com/p/1227
One of the works on this subject is his “al‐Fatwaa al‐Hamawiyyah” which he wrote as an answer to a question presented to him. In it, he was asked what the scholars and Imaams of the religion say concerning the Aayaat and the Ahaadeeth of the Si/aat, or the attributes and characteristics of Allah.
Author: Sheikh-ul-Islam ibn Taymiyyah
What Does it Mean : You Are a Muslim ?
Author: Suleiman Saoud Al Saqer
Publisher: Islamic Propagation Office in Rabwah
Choose Your Path: This book divided into five chapters; as follows: Chapter I: Where Am I Come from? Proof God is One and only. Chapter II: Proving Prophet Muhammad's Prophethood Chapter III: Some Characteristics of Islam Chapter IV: The Result According to Belief or Disbelief Chapter V: What Is Next? Concluded this book with an answer.
Author: Ayman Bin Baha Uddin Al-Siraj
Reveiwers: Muhammad AbdulRaoof
The Nine Conditions of the Testimony of Faith.
Author: Jamaal Zarabozo
Publisher: Al-Basheer Magazine
Source: http://www.islamhouse.com/p/1371