How to write a Blues song

I found a website that helps with write the music to a blues song it breaks it down really simply and even has information about how to write lyrics 

unknown(s.d)Construct a Blues song. At: http://www.wikihow.com/Construct-a-Blues-Song (accessed 03.03.2013) 

I also found a webpage that I took a screen shot of that explains how to structure the lyrics for a blues song.

unknown  (s.d).Writing blues lyrics Handout. At: http://www.jamesfrankel.com/Writing%20Blues%20Lyrics%20Hand.htm ( accessed 03.03.2013)