(1).Understanding body language: personal space

http://psychology.about.com/od/nonverbalcommunication/ss/understanding-body-language_8.htm

(2). Wikipedia: Personal space

http://en.wikipedia.org/wiki/Personal_space

(3). Social distance:

http://changingminds.org/techniques/body/social_distance.htm

(4). “Cultural distance” among speakers of the same language (an article):

http://www.sens-public.org/spip.php?article653&lang=fr

(5). Hidden aspects of communication (proxemics and cultural use of space):

http://anthro.palomar.edu/language/language_6.htm

(6). How to communicate well with people from other cultures:

http://www.wikihow.com/Communicate-Well-With-People-from-Other-Cultures

(7). Non-verbal communication (closeness and personal space):

http://www.skillsyouneed.com/ips/nonverbal-communication.html