What type of pronoun is THIS in the sentence this authors first book?

In the sentence "This author's first book," the pronoun "this" is a demonstrative pronoun.

Here's why:

* Demonstrative pronouns point to specific things or people. They are used to indicate which person or thing is being referred to.

* In this sentence, "this" is specifying a particular author (likely one already known in the context).

Let me know if you have any other pronoun questions!