You guys could start with the utmost simple and timeless master piece in our field which I think is considered a staple…
The Design of Everyday things by Don Norman
My tutor recommends this to each of his new students starting out in UX.
If jumping off the topic of UX and into the topic of something else like success … Think and Grow Rich, Wealth Secrets of the One percent are also phenomenal. Tony Robbins also has some very inspirational and solid books for those seeking life improvement.