Capitalization in Titles of Works

Q. How to treat names of apps? I am copyediting a newsletter for a professional organization. A couple of the articles discuss iPad/smart-phone apps. I am at a loss as to how to treat those names: Initial caps only? Initial caps, roman? Italics? In quotes? Any suggestions? CMOS 16 is mute, alas. I should note that the issue is possibly more complicated because some of the apps carry the same names as the books upon which they are based.

A. For this you will need CMOS 17, which shows how to style the names of apps and related terms at 8.155. And for an example of the app version of a book, see 14.268.