http://www.mp3-box.org/itunes-mp3-audiobook/
How can I turn an .mp3 to an audiobook in itunes?
How can I turn a .mp3 into an audiobook so it will show up in the audiobook section on itunes?
I suggest you try the following link http://www.macworld.com/article/55190/2007/02/convertaudiobooks.html
They’re experts and they have developed a really simple instruction.
Converting mp3 to audiobook format in iTunes.wmv