In my apps, I include a list of my apps that link to their pages. But I couldn’t figure out how to link to my eBook in iBooks. A kind soul said to use this format: http://itunes.apple.com/us/book/isbn9781465813718
Just replace the ISBN number for your own.
Reference: http://www.kindleexpert.com/how-to-link-directly-to-your-ebook-in-the-ibookstore/
Wish you could add an eBook to the iBookstore? Go to Smashwords for all the information. Download their free manual and follow it precisely for best results.