I found these to be very helpful in learning how to carve rubber stamps:
Julie Hagan Bloch has a great little book she hand lettered all about carving stamps. She also wrote and illustrated the book. It's soft cover and about 20 pages long and excellent. When I purchased it it was $5.95.
Name of book: Carving Stamps
Author: Julie Hagan Bloch
ISBN # 1-882817-05-2
In 2004 I spent a day with Julie in her studio and she showed me how she carves her stamps. She was gracious and helpful and has 1,000's of hand carved stamps.
Art Stamping Workshop, by Gloria Page
soft cover, 127 pages long
(I have artwork in this book on page 110)
$22.99 Northlight Books