- The Hidden Dimension, by Edward T. Hall
- Beyond Culture, also by Edward T. Hall
- Communication Between Cultures, 5th ed., by Larry A. Samovar and Richard E. Porter
The first two books are ones I should have read a long time ago, but didn't have time for until--well, actually, I still don't have time for them. But I'll make time to read them before next fall.
(This website has some information about proxemics, which is the theme of The Hidden Dimension.)