Free Lua Books

Programming in Lua
This is an online version of the Lua book.

Lua Documentation
The is the official definition of the Lua language.

Lua 5 Quick Reference
A Lua 5 Quick Reference available in pdf and postscript formats.

A No-Frills Introduction to Lua 5.1 VM Instructions
A basic guide to all the instructions of the Lua 5.1 virtual machine (PDF)