(1) International Digital Publishing Forum;
"Publishers Report Continued Increases in eBook Revenue for 2005"
http://www.idpf.org/doc_library/statistics/2005.htm
Accessed on October 20, 2006
(2) InformationWeek; "New Technologies Transform Publishing
Industry: Production Time and Costs are Being Cut While Publishers Gain More Flexibility"
By: Barbara DePompa Reimers, March 27, 2000
http://www.informationweek.com/779/ebooks.htm
Accessed on November 13, 2006
(3) D-Lib Magazine, volume 7, number 6 (June 2001);
"Digital Rights Management (DRM)
Architectures"
By: Renato Iannella
http://www.dlib.org/dlib/june01/iannella/06iannella.html
Accessed on October 20, 2006
(4) Writers Write: the Internet Writing Journal;
"The Problems of eBook Publishing: Part II"
By: Paul Papanek Stork
http://www.writerswrite.com/journal/dec00/stork2.htm
Accessed on November 22, 2006