Greeting Card Designer Booklets on Amazon
ART LICENSING Booklet on 20 Steps to Art Licensing that is a list of suggested steps to to take for getting into art licensing. How to license your art to companies that publish greeting cards, and manufacture coffee mugs, magnets, wall hangings, kitchen items, and dozens of other gift items. This booklet covers 20 basic steps from how to prepare your art, to what companies to contact. It includes topics on: How to find agents, classes and what trade shows to attend. There are extensive resources on social media, licensing community groups, and lists of interviews with professional designers (5,200 words).
CARD WRITINGBooklet on 7 Mistakes Greeting Card Writers Make A list of 7 things to avoid when submitting greeting card verse to publishers.Includes a list of card publishers and their guidelines, links to writer interviews, articles, card samples and other current resources. 20-page booklet and 2,300 words and 8 Pages of Card Samples.
MARKETING CARDS
Booklet on Unusual Ways To Market Greeting Cards, and 22 places to get your designs featured. A 20 page booklet on how to get your cards noticed in non-traditional ways. Everything from why you should send cards to your dentist, to how to get special features in national publications. Great tips for designers who are starting out and want to get their cards into the hands of people beyond friends and family. Special Section: Submissions guidelines and contacts for 22 Gift Industry publications and professional gift industry blogs that seek out new greeting card designs to feature for free. (5,000 Words and 17 greeting card images included) Thanks for helping to support this Blog
These are books I own and recommend.
Some may be out of print, but used copies may be available. Check link.
Start & Run a Greeting Cards BusinessBook covers starting a card business in the UK.
Good basic info, but financial/measurement info is in different monetary units.

Greeting Card DesignBook that shows examples of professional card design.

Publishing Your Art as CardsHow to make and sell your own cards for an extra income.

Pushing the Envelope How to work with greeting card sales reps.

Complete Guide to Greeting Card Design and IllustrationGreat Book on understanding the greeting card profession and how to develop a style.

1000 Handmade Greetings: creative cards and clever correspondenceThis is not a simple craft book for hobbyists,instead it is a picture book of professionally handmade cards by leading companies and designers.

By the Batch: Creative Cards, Postcards, Envelopes & MoreBook that addresses how to "manufacture" handmade greeting cards.

How to Write and Sell Greeting Cards, Bumper Stickers, Tshirts and Other Fun Stuff
Sell the Fun Stuff: Writers' and Artists' Market Guidelines for Greeting Cards,
Posters, Rubber Stamps, T-Shirts, Aprons, Bumper Stickers, and More!
Writing Card Sentiments 
Freelance Writing for Greeting CardsAnother good book on how to write for cards professionally.

You Can Write Your Own Greeting CardsClear guidelines on how to write card sentiments professionally.

Finding the Right WordsOne of many basic books of this series that tells you how to add words products, cards, etc.
Licensing Your Art to Companies

Licensing Art and Design
Licensing Art 101Good beginners guide on the art licensing business.

2011 Artist's and Graphic Designer's Market List of greeting card companies, art licensees and agents.Detailed information on submission guidelines.
Gift and Product Design

Start with a Scan One of a kind book that tells you how to transform your art into a scan and what to do with it from there.

Design Your Own Repeat PatternsSimple book on learning repeats.

Twentieth-Century Pattern Design Great book for inspiration and creative approaches to designing patterns.

How to Break into Product DesignOverview of product design in all industries.

Designing a Digital PortfolioShows you how to put a digital portfolio together for the modern era.

Mary Engelbreit: The Art And The ArtistAmazing story of how Mary ended up doing licensing.

Principles of Pattern DesignGood info on pattern design

Imagery on FabricBasic info on putting images onto fabric.

Graphic Artist's Guild Handbook of Pricing Yearly updated guidelines for pricing for people in art careers.

5,000 Years of TextilesFar East, Americas, Africa, Scandinavia, and Egyptian. Good for studying fabric design.

Abstract Design and How to Create ItOver 380 illustrations, diagrams, designs, border patterns and textile patterns.

Creative Illustration WorkshopExercises for integrating illustration with other mixed-media techniques, and scan and layer your illustrations using a computer.

Print WorkshopHand-Printing Techniques for low budgets. Interesting ways to put imagery on products. Perhaps a good technique for putting our designs on model items to show what they would look like on real products.

Digital AlchemyPrintmaking techniques for fine art and how to transfer images to a variety of surfaces. It includes decals and skins.

Critical MassCutting-edge developments in international printmaking. Since printmaking is fundamental in most surface design concepts, this book's goal is a modern approach on a traditional printmaking.
Tradeshows and Booth Design 
How to Design a "Wow!" Trade Show Booth Without Spending a FortuneSimple tips for your first tradeshow booth.

Tips and Tales from the Booth Avoiding Trade Show Mistakes

Build a Better Trade Show ImageProfessional recommendations for doing a tradeshow. Advice to take before you attempt one.
~ Copyright Legal Books for Artists ~
Legal Guide for the Visual Artist, Fifth Edition
Copyright Law for Artists, Photographers and Designers (Essential Guides)
The Copyright Handbook: What Every Writer Needs to Know