I’m sure Internet is offering only secondary sources, so I can’t really tell you that you will get primary sources here
You might like to check these website thoughhttp://en.wikipedia.org/wiki/El_Grecohttp://www.doe.virginia.gov/VDOE/Instruc…http://www.pptpalooza.net/PPTs/EHAP/Mann…http://www.dms.provo.edu/TEACHERS/LORNAT…http://www.artunframed.com/el_greco.htmhttp://www.wga.hu/html/g/greco_el/index.…