Conference Lecture CDs with ISBNs

[Kathleen]

There are some Audio CDs that have ISBNs but are not audiobooks, they are recorded conference lectures. I'm thinking of this one specifically: Hollywood's Most Despised Villian. I marked this NOT A BOOK, but another librarian changed it back because it is listed as an audiobook on World Cat. I own the CD in question and it is not an audiobook, it is a conference lecture recording. So, the question is, are these kinds of CDs books or not?

[Ralph Gallagher]

Looks like it would be NAB'd to me.

[Melody]

Dang World Cat. I'll remove my comment and change it back. Some of these things are so hard to tell.