ISBN for electronic publications 7. Printing of ISBN 8. Adminstration of the International ISBN system 9. Non-participation publishers 10. Practical uses of ISBN 11.
Experience suggests that hyphens are preferable to spaces.
The number of digits in the group number and in the publisher prefix is determined by the quantity of titles planned to be produced by the publisher or publisher group. Publishers or publisher groups with large title outputs are represented by fewer digits. Group identifier The first part of the ISBN identifies a country, area or language area participating in the ISBN system. A group identifier may consist of up to 5 digits. All group identifiers are allocated by the International ISBN Agency in Berlin.