Helpful Books for Writers (and others)
Create great characters, or just understand your own with these two great books on temperament studies:

by Beverly LaHaye
An exploration of the four basic temperament types and sixteen temperament blends and how it affects women.
UNDERSTAND YOUR MAN:  Secrets of the Male Temperament, by Tim LaHaye
The four basic and sixteen temperament blends, how it applies to men, and how it affects the women who love them.

Highly recommended for historical fiction reference:
the EVERYDAY LIFE series from Writer's Digest Books. 

(more of my favorite titles coming soon)