Three books that are set on the river are Life on the Mississippi, Tom Sawyer, and Pudd’nhead Wilson. In the given sentence that is used as a Demonstrative pronoun.
The same terms are employed as demonstrative adjectives when they modify nouns or pronouns: "this apple," "those boys." Pronouns that point to specific things include this, that, these, and those, as in "This is an apple," "Those are lads," or "Take these to the cashier."
In order to make it apparent to your readers whose notion you are referring to from the previous sentence or thought, it is usually helpful to provide a noun (person, place, thing, or idea) or a noun phrase (a phrase defining a person, place, thing, or idea) after the demonstrative pronoun.
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