There's an Alien in My Backpack

From Author Wars - https://authorwars.com/publications/theres-an-alien-in-my-backpack-77863.html

Overview:

Title: There's an Alien in My Backpack
Author: Bruce Coville
Year: 2000
ISBN-10: 0606202013
Publisher: Turtleback Books
Price: $10.64
Binding: Hardcover
Type: Novel
Title Reference: There's an Alien in My Backpack
Notes: Unknown