Pro Active Record: Databases with Ruby and Rails by Chad Pytel, Jonathan Yurek,

Pro Active Record: Databases with Ruby and Rails (Expert's Voice

The Manga Guide to Databases, Co. Ltd, Trent–pro

Ruby on Rails: Up and Running - 9780596101329, paperback, Bruce A Tate

Rails 5 Way, The (Addison-Wesley Professional Ruby Series)

Pro Active Record: Databases with Ruby and Rails by Chad Pytel: New

Pro Active Record: Databases With Ruby And Rails