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
Bulugh Al-Maram (attainment of the objective according to the evidence of the ordinances) is based upon the Ahadith of our Prophet which have been the sources of Islamic Jurisprudence. Al-Hafiz Ibn Hajar Al-Asqalani has recorded the true significance of the Ahadith and their origins & also made a comparison of the versions, if the sources are more than one.
Author: Ibn Hajar Al-Asqalani
Why I Chose Islam: A story of a priest who reverted to Islam, it is based on a True Story.
Author: M. Emery
Publisher: Islamic Propagation Office in Rabwah
One Hundred famous Weak or Fabricated Traditions attributed to the Prophet.
Author: Ihsan Al-Utaibi
" And indeed, you are of a great moral character." (Quran, 68:4)
Author: Ahmed Deedat
A nice discussion of some important points needed by those callling to Islam
Source: http://www.islamhouse.com/p/1243