Cookie Jar Books
Cookie jar books are important for all serious collectors. You should take every opportunity available to compile a library about your hobby. This is very important if you wish to pay fair prices for "authentic" jars. There are many good cookie jar books and price guides on the market. These books will give collectors more in-depth information on the production details - such as size, weight, colors, years of manufacture, marks and excellent photos.
There are also cookie jar books specific to the major manufacturers of cookie jars, such as McCoy, Shawnee, Red Wing etc., which can be even more detailed with regards to the jars made by that firm.
Here are some auctions for discount new and used Cookie Jar Books