There are many books written about Lua. Some focus on using the language as a standalone tool, others on how to use the language in an embedded scripting environment. Here is a list of additional book resources in no particular order.
Books
Programming In Lua
Ierusalimschy, Roberto. Programming in Lua, 4th edition. Lua.Org, 2016.
ISBN13: 9788590379867
Programming in Lua (PIL) is written by the creators of Lua. The book takes an example-based approach to teaching—many of the non trivial concepts in the book are explained with real world code samples. The first edition of Programming in Lua is available online, for free.
