Click on the Book in SQUIZYA LIBRARY to open the expanded view. From there you will see all the component zApps contained within the book and an Open zApp Book button. The Open zApp Book button will take you to the contents page where you can see what zApps are included in each chapter and the layout of the book. From within MY LIBRARY all books are shown in expanded form so you can easily see the contents of each book.
To open a zApp within a Book, click on the zApp you want to open and the expanded view will appear. From there you will be able to select Open zApp.