This week's New York Times Bestsellers (September 21st)

In hardcover:

Chuck Wendig's Star Wars: Aftermath is down one spot, finishing the week at number 5.

In paperback:

Andy Weir's The Martian maintains its position at number 1 (trade paperback).

Andy Weir's The Martian is up four spots, finishing the week at number 3.

Ernest Cline’s Ready Player One maintains its position at number 10 (trade paperback).