You will need an ISBN (International Standard Book Number) for your book if you want it to be sold through retailers. It enables retailers to track the number of copies your book has sold and allows readers to order your book. Nielsen allocates these in the UK, and self-publishing companies can help to arrange this for your book. A different ISBN may be required for the e-book version of the print. If you do not want your book to be sold through retailers you do not need an ISBN.
You will need an ISBN (International Standard Book Number) for your book if you want it to be sold through retailers. It enables retailers to track the number of copies your book has sold and allows readers to order your book. Nielsen allocates these in the UK, and self-publishing companies can help to arrange this for your book. A different ISBN may be required for the e-book version of the print. If you do not want your book to be sold through retailers you do not need an ISBN.