1. Kenneth McConnell, Dennis Bodson & Stephen Urban,FAX Facsimile Technology and Systems, Artech House, INC. 685 Canton street Norwood, MA 02062
2. Stefan Katzenbeisser & Fabien A P Petitcolas,Information Hiding techniques for steganography and digital watermarking, Artech House, Inc. 685 Canton street Norwood, MA 02062
3. http://www,ee.princeton.edu/~minwu/research/binarvDH/
4. http://www.jjtc.com/Steganography/
5. http://www.jjtc.com/stegdoc/stegdoc.html