Libéro (football) - Wikiwand

Catenaccio - Wikiwand

Sebastião Lazaroni - Wikiwand

International Federation of Football History & Statistics - Wikiwand

File:2006 UT football fall scrimmage.JPG - Wikipedia

The Libero - A Different Take on the 3421 : r/EASportsFC

World Cup Countdown: 18 Weeks to Go - Karl Rappan's 'Libero' & the Global Icons Who Evolved the Role - Sports Illustrated

Armando Picchi - Wikiwand

Teodor Salparov - Wikiwand

What is a Libero?

South Korea's K-League Taps Viz Libero for Enhanced Football Analysis

Jörn Lenz - Wikiwand

Ugo Ferrante - Wikiwand

Adidas Etrusco Unico - Wikiwand

Franz Beckenbauer was a graceful and visionary 'libero' who changed the face of soccer