Lua 4.0 : http://www.lua.org/manual/4.0/
Lua 5.0 : http://www.lua.org/manual/5.0/
Lua 5.1 : http://www.lua.org/manual/5.1/
Lua 5.2 : http://www.lua.org/manual/5.2/

Lua 5.3 : http://www.lua.org/manual/5.3/

2. Lua其他参考手册

Lua 5.3(云风翻译) : http://cloudwu.github.io/lua53doc/