Here's a complete book promo mockup you can use. Each book is compiled into it's own Photoshop group so you can easily add and remove objects.
I'm on a roll! I'm filling requests for more ebook mockups. Use this mockup to present a series of ebooks— without the illusion of something tangible. Comes in useful when trying to avoid misleading a potential customer of a physical item. The PSD comes with two groups for accommodating a 4 ebook series or even 3! Read & Download