Here are a few examples of books and online materials that the Crandal Public Library contains on the topic of Amigurumi. Each of these texts is a guide to help you learn how to crochet dolls, even providing "recipes" (or instructions) for creating unique individual dolls.
Crandall Public Library Catalog
This is the link to the Crandall Public Library Catalog, which is part of the Mohawk Valley and Southern Adirondack system. Here you can search through the collection of each library in the system, but by default, it is set to search through the Crandall Public Library collection. Like the other resources, you can use boolean operators to string words together to form a search.
Search Subjects: Here are some of the subject catagories that you can use to find amigurumi.
Crocheting -- Patterns, amigurumi -- Patterns, Stuffed animals (Toys), Soft toy making, amigurumi, Crocheting, Dollmaking, Knitting, Animism, and Japan.