Apple has added the iOS Human Interface Guidelines for App Store app designers to the iBookstore. Previously, the guidelines were solely available from the online Apple developer portal, and the addition to the iBookstore makes the guidelines for designing iOS 7 apps more easily accessible.

Federico Viticci notes at MacStories that the book is properly optimized for viewing on the iPad:

The book can be downloaded for free on iOS or OS X.

Apple’s “iOS Human Interface Guidelines” is now available on the iBookstore: https://t.co/3UKBgttv5L

— Dave Addey (@daveaddey) May 13, 2014

@viticci Yep, just released today. The team here have done a really nice job of it, too.