The wikipedia guide to goblins
This is a great resource on goblins. Lots of information. descriptions, history and much more. The first place to look when you want to learn about goblins.
Encyclopedia Mythica -The definition of a goblin. The Encyclopedia Mythica is a great resource for all things mythological. You should bookmark it.
Goblin Books at Amazon.com
Amazon has a great selection of goblin books. This link takes you directly to their results page.
-Goblins This book is simply terrific. You have got to read about it and the reviews about it.
The Goblin of Giotto's Tower - Here is a nice legend you probably never heard of.
How to Draw a goblin - Instructions on how to draw a goblin. Aimed at young children. This monsterexchange site is great.