This is an introductory book on Islam which serves as a good da'wah tool. It helps in explaining some of the fundamentals of Islam, also helps in signifying verses of the Qur'an and how they relate to science and the world around us.

Other Sources:

Read Surah Abasa (Chapter 80) from Quran - Arabic English Translation

Read Surah Ad-Duha (Chapter 93) from Quran - Arabic English Translation

Caliph Ali and Shia

Islamic view on the story of disciples in Christianity