Getting very little and slow feadback from Apple on this. So far they have only gave me the format to link single book.
Here's there explanation....
To create a link:
1. Start with the base address of itunes.apple.com
2. Add a / and then the ISO code of the country you want to view (ex. US, GB, FR)
3. Add another / and the word book
4. Add another / and the word ISBN
4. Add the ISBN you want to view
If anyone has any more than the above I would love to see examples.