I noticed a particularly readable and enjoyable book on the whole topic of subselves and the social situations that generate them.

The book is called Multiplicity, by a science writer from England named Rita Carter.

Here's the link to a page on Rita's web site about this book:http://ritacarter.co.uk/page6.htm

Copies of it are available on Amazon.com; just follow this link:
http://www.amazon.com/Multiplicity-S.../dp/031611538X