The X Factor

From Author Wars - https://authorwars.com/publications/the-x-factor-248457.html

Overview:

Title: The X Factor
Author: Andre Norton
Year: 1981
ISBN-10: 0449243958
Publisher: Fawcett Crest
Price: $2.25
Pages: 191
Binding: Paperback
Type: Novel
Title Reference: The X Factor
Notes:
• "First Fawcett Crest Printing: April 1981" • Full number line 10—1 • The artist is not credited, stylized initials KB are on the artwork, same signature as seen on artist's home page (http://kenbarroriginalartwork.com/).