Goodreads: E.T.A Hoffmann
http://www.goodreads.com/author/show/7267068.E_T_A_Hoffmann
More information about Hoffmann as an author, quotes and analysis of other works, and reader comments.
Encyclopedia Britannica: E. T. A. Hoffmann
http://www.britannica.com/biography/E-T-A-Hoffmann
The Encyclopedia Britannica entry on E. T. A. Hoffmann, providing more background to his life and works.