Best book for the "psychology" side of poker?

[IDN101]

I have the following books:

GSIH
SSHE
TOP
SS

I would really like a book on the "mindset" / thought-processes of poker players.

I feel I have enough books (for now) on the mechanics of the game. I am looking for something on the mental aspects.

The ones I have heard of are:
Inside the Poker Mind
Zen and the Art of Poker


Any recommendations greatly appreciated.

Many thanks
Regards,
Ian