Bing found the following results
Linebacker - Wikipedia
What is a Linebacker in Football? (LB Position Guide)
How To Make Great Linebackers: Essential Drills & Techniques
How To Play Linebacker In Football – Complete Guide
The Linebacker Position: An In-Depth Guide - Throw Deep
The Role of a Linebacker in Football - LiveAbout
25 Greatest Linebackers in NFL History - Athlon Sports
Linebacker in Football: Understanding the Position
Football Linebacker Types - rookieroad.com
Football Linebacker - rookieroad.com