Abu Bakr as-Siddiq - Abd as-Sattar Al-Sheikh

Excellent biography of the first Caliph and the best of the men of this Ummah, Abu Bakr. The biography is very well constructed, very informative, easy to read. All sources (trusted only) are mentioned at the bottom of the page.

The edition is also beautiful, pleasant to read, neat, and with a common design for the 4 caliphs to make a beautiful collection of biographies.