Both Uses

sequel
in
Franny and Zooey
(Auto-generated)

That little book is called 'The Pilgrim Continues His Way,' and it's a sequel to another little book, called 'The Way of a Pilgrim,' which she's also dragging around with her, and she got both books out of Seymour and Buddy's old room, where they've been sitting on Seymour's desk for as long as I can remember.†
Chpt 2.2
The sequel, 'The Pilgrim Continues His Way,' is mostly a dissertation in dialogue form on the whys and wherefores of the Jesus Prayer.†
Chpt 2.2 *

Definitions:

(1) (sequel)
something that follows and continues something else -- especially a film or book

or more rarely: something that follows as a result of something else
(2) (meaning too rare to warrant focus)
More rarely, sequel can reference anything that follows something else. For example, "She had such a good year, I'm wondering what she will do as a sequel."