In addition to what is mentioned above, there are several books on LUA available via Amazon and perhaps your local bookstore if they have a decent computer section.
I also really recommend the book, Game Scripting Mastery. It details very well how to implement scripting into your game or engine, and it has a section on LUA, as well.
I also really recommend the book, Game Scripting Mastery. It details very well how to implement scripting into your game or engine, and it has a section on LUA, as well.