Books on Piano Technique

[canoluk2003]

Hi all,
I have been self learning the Piano for the past few years,
and I'm now a diploma level pianist.
I'm seeking to further improve my play, however without much guidance, I think I'm stuck.
Are there any books on piano technique that are suitable for my level?
If so, do you have any suggestions?
(I prefer self-learning because I literally have no time for piano lessons..)
THanks a lot
canoluk2003

P.S. By books, I mean books on the Piano that are similar to textbooks on physics, math, language etc. Not books like Hanon, Czerny etc.

[diomedes]

I prefer self-learning because I literally have no time for piano lessons

Get a decent teacher. Or find something better to do.

[chopinlover01]

If you cannot get a decent teacher, watch Josh Wright's videos on technique

[hardy_practice]

Gerig should be in your library.

[lostinidlewonder]

I'm seeking to further improve my play, however without much guidance, I think I'm stuck.
Are there any books on piano technique that are suitable for my level?

If you are stuck do you think reading will help?