Biography: http://www.poets.org/poet.php/prmPID/116

Songs of Innocence and Experience:

http://www.theotherpages.org/poems/blake02.html

or

http://www.gutenberg.org/ebooks/1934

Book: The drawings and engravings of William Blake (1922)

http://archive.org/details/drawingsengravin00blakuoft

The William Blake archive: http://www.blakearchive.org/blake/