Books

The Hobbit, or There and Back Again by J.R.R. Tolkien (goodreads.com)

The Fellowship of the Ring by J.R.R. Tolkien (goodreads.com)

The Two Towers by J.R.R. Tolkien (goodreads.com)

The Python Language Reference: Release 3.6.4 by Guido van Rossum (goodreads.com)

PostgreSQL 11 Documentation Manual Version 11.2: Volume 1 Chapters 1-36 by PostgreSQL Global Development Group (goodreads.com)