Obtain Publication Numbers

ISBN, ISSN and Government of Canada (GC) Catalogue Number

Obtaining an International Standard Book Number (ISBN) and Government of Canada catalogue number for your publication ensures that Canadians have ready and equal access to Government of Canada information.

If your publication is a serial, instead of an ISBN, obtain an International Standard Serial Number (ISSN).

If you haven't done so already, here's how to acquire your GC numbers.