[web:171fd7f6ab]http://babelfish.altavista.com/babelfish/trurl_pagecontent?lp=ru_en&trurl=http%3a%2f%2fpsyc hotype.ru%2farticle%2fa-4.html[/web:171fd7f6ab]

This explains on what socionics is really built upon.

In this website there is also pretty good other theoretic material...