Every publication is required to have its own ISBN Number – International Standard Book Number. All new additions or revisions must have their own unique identification number as well.
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Google for ISBN information in your country.
Amazon KDP, CreateSpace, and Smashwords offer free Identity Numbers when you publish with them. Make use of their services.
South Africans may obtain free ISBN numbers from the the ISN Agency for South Africa, located at the National Library of South Africa. The ISN Agency assigns ISBN and ISSN to South African publications.
The National Librarian
The National Library of South Africa
P.O. Box 397