Copies of later editions do not have to be deposited unless they differ from the original publication.
Where more than one format exists only one version needs to be deposited. Print is preferred to electronic; hard cover is preferred to paperback.
There is no need for a publication to have an identifier like ISBN, ISMN or ISSN for Legal Deposit purposes. ISBNs are used by the retail book trade but are not required for Legal Deposit.
A free ISBN service for Australian publishers is provided by the National Library of Australia and Thorpe Bowker.
Allocation of a unique code for the identification of publications which can be used wherever information on publications needs to be recorded or communicated:
- International Standard Serial Number (ISSN)
- International Standard Book Number (ISBN).