http://en.wikipedia.org/wiki/Muhammad
http://www.islamicfinder.org/articles/article.php?id=1004&lang=english
http://www.lastprophet.info/category/muhammad
http://www.youtube.com/results?search_query=muhammad+peace+be+upon+him&page=2
Safi, O., (2009). Memories of Muhammad: Why the prophet Matters. Ny 10022.
http://d1.islamhouse.com/data/en/ih_books/single2/en_Who_is_Muhammad.pdf