"Muhammad is the Messenger of Allah." [Qur'an 48:29]
Much has been written about the Prophet Muhammad (saas), from indepth biographies by Muslim scholars and non-Muslim researchers to sayings upon sayings of others. Muhammad ibnu Abdillah was born in Mecca in the year 569 CE. He earned his living as a trader and was known by his people as al-amin (the trustworthy one). When Muhammad (saas) reached the age of 40, the angel Gabriel came to him with revelations that established his prophethood. Muhammad (saas) was first ordered to instruct his immediate family on Islam, including his beloved wife Khadija, but eventually it was revealed to him that he should begin delivering the message to all of mankind. In the next 20 years of his life, he communicated the message of Allah to his people, and set an example for how each human being should lead her or his life. This is especially valuable since Muhammad (saas) is the last Prophet of Allah. In the year 632, the year of his death, the Prophet delivered his famous last sermon.
This book is one of the best book talking about Muhammad(saas)life from reliable sources.