These are my personal recommendations and do not infer that there are not other sources that are equally valid. I simply do not know them all. These are simply the best I have come across.

Style Statement: Live by Your Own Design, Carrie McCarthy and Danielle LaPorte

The Triumph of Individual Style: A Guide to Dressing Your Body, Your Beauty, Your Self, Carla Mason Mathis and Helen Villa Connor

Callanetics, Callan Pinckney (If you can still find it. This has an exercise theory that totally changed my life! There are newer resources available online now.)

7 Habits of Highly Effective People, Stephen R. Covey

Caygill Trained Color and Image Analysts

John Kitchener of Personal Style Counselors

Jennifer Butler of Jennifer Butler Color

Carla Mathis of The Style Core

Seasonally Trained Color Analysts

12 Blueprints, Christine Scaman

Pretty Your World (ColorBreeze System), Lora Alexander

Helpful Websites & Blogs

Inside Out Style, Imogen Lamport (amazing how-to info)

Expressing Your Truth, Jane Rekas (a good clearinghouse of info)