First modern Looping, Revolution at Magic Mountain: the people and story behind it. Ever wondered about the truss design? Yea, it was because of T-Shirts. : r/rollercoasters
Coaster books! : r/rollercoasters
Stories from the Oktoberfest | simply Munich
Roller Coaster: Der Achterbahn Designer Werner Stengel - Ausstellung im Münchner Stadtmuseum (2002)
Who is Werner Stengel? | The Man Who Designed Over 500 Roller Coasters - YouTube
Teststrecke - Coasterpedia - The Roller Coaster and Flat Ride Wiki
On Paper, the World's Smoothest Roller Coaster Ride | Fox News