Audiobooks. (Genre/Form Term)

Dictionary.com, Mar. 10, 2008 (audio book; also audiobook; a recording of an oral reading of a book, often in abridged form)

Wikipedia, Mar. 10, 2008 (audiobook; a recording that is primarily of the spoken word as opposed to music; not intended to be descriptive of the word "book" but rather a recorded spoken program in its own right and not always an audio version of a book)

Montana State Library website, Mar. 10, 2008: Montana Talking Book Library (cassette books; recorded books)

NetLibrary web site, Mar. 10, 2008 (books on tape)

LCSH, Mar. 10, 2008 (hdg: Audiobooks)

OED online, April 27, 2010: audiobook (an audio recording of a reading of a book (typically a novel), produced commercially)

This heading is used as a genre/form heading for recordings of oral readings of books.

Example under Sound recordings