You need the 2007 Update to Braille Formats (includes update to EBAE and Nemeth Code) available at the BANA website http://www.brailleauthority.org. Click on the Latest Code Updates link. Here is a link to the .pdf download.
This download is critical and has been adopted as part of the rules. It has been in effect since 2008. See the Formats section for the format to use for the ISBN number.