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Selling your e-book on Amazon, Barnes&Noble, Apple or Kobo doesn’t require an ISBN, but it will be necessary, as soon as you start your books print version. Any book on your book shelf, library or in book stores has an ISBN.

ISBN is the International Standard Book Number, a 13-digit number that uniquely identifies books published anywhere in the world. Parts of an ISBN are:

• group or country identified
• publisher identifier
• title identifier
• and the check digit

ISBN numbers are assigned by a group of agencies worldwide coordinated by the International ISBN Agency in London, England. In the United States, ISBN’s are assigned by the U.S. ISBN Agency: R.R. Bowker is the independent agent in the US for this system.  You can order an ISBN online – or even better, a block of ten. On average it takes about two weeks for ISBN’s to be assigned.  In…