Hi, just saw your reply. I'm glad it helped. Other books I recommend are "The Wisdom of the Enneagram," (very good advice, though based on a different test) "8 Keys to Self Leadership" (fun exercises for INTJs, mainly Ni, Te, Ti, Se, and Fi, but also Fe and Si if you really want to round out your personality--btw Nardi himself is an INTJ) and "The New Diary" by Rainer (a good way to coax out helpful extraverted thinking in an INTJ).

Online references I like include the Socionics wiki and the Personality Junkie website.

http://personalityjunkie.com/the-intj/

Hope that's helpful.