Title: 101 Harley-Davidson Twin Cam Performance Projects, Author: Mark Zimmerman
Title: Donny's Unauthorized Technical Guide to Harley Davidson 1936-2008: Volume I: The Twin Cam, Author: Donny Petersen
Title: Donny's Unauthorized Technical Guide to Harley-Davidson, 1936 to Present: Volume III: The Evolution: 1984 to 2000, Author: Donny Petersen
Title: Donny's Unauthorized Technical Guide to Harley-Davidson, 1936 to Present: Volume V: Part I of II-The Shovelhead: 1966 to 1985, Author: Donny Petersen
Title: HD Sportster Hop-Up & Customizing Guide, Author: Todd Zallaps