For fitting, I refer to most:
Fast Fit by Sandra Betzina
Fit for Real People by Palmer & Pletsch
Fitting & Pattern Alteration by Liechty et al
For sewing, these have been my best references:
The Complete Book of Sewing (published by DK in 1996) I believe Alison Smith is the author of the current iteration of this book. I can't recall the expert/author associated with my version. At any rate, I believe the versions to be similar. I really like mine.
The Dressmaker's Technique Bible by Lorna Knight
The Sewing Answer Book by Barbara Weiland Talbert
Power Sewing Step-by-Step by Sandra Betzina
These are three older books that I've picked up within the last year that I wish I had when I started sewing. I'm still very glad to have them now:
Reader's Digest that has been mentioned several times already
The Bishop Method of Clothing Construction
Simplicity Sewing Book from 1958