Home site; lightweight, made to extend programs, often used for general-purpose, standalone use; simple procedural syntax, powerful data description constructs use associative arrays, extensible semantics; dynamically typed, bytecode interpreted, garb...
Overview from journal, by Roberto Ierusalimschy, Luiz Henrique de Figueiredo, Waldemar Celes Filho; Software: Practice and Experience, John Wiley and Sons, 1996.
By Roberto Ierusalimschy; Lua.org, 2003, ISBN 8590379817. Official book, by Lua's main architect, covers all aspects, from basics to API with C; gives solid base for programmers to use Lua.
Alternative interface for browsing the Lua reference manual. Include overview, search facility, and extensible URLs aimed at quick access to specific parts of the documentation.