Why are my apps and others not showing on itunes?

I recently moved my itunes folder to an external hard drive. Since then my apps, ringtones and books are not showing on itunes when loaded up on my laptop. Music, films and tv programmes are all fine and playback fine.

I have checked the itunes media folder on the external hard drive to make sure they are there to which they are, they are also in there respective folders inside the media folder.