International Football Association Board | IFAB
VAR at the 2018 FIFA World Cup™ - Innovations - Football Technology - FIFA
Philosophy Referee Signals | Philosophy, Referee, Hand signals
Amazon.com : Adams Basketball Referee Penalty Signal Reference Game Card : Sports & Outdoors
VAR at the FIFA Women's World Cup 2019™ - Innovations - Football Technology - FIFA
BBC SPORT | Football | Laws & Equipment | Know your referee's signals?
Official/Player Communication Influences Conduct - Referee.com
Official Football Signals
The IFAB on Twitter: "What is the difference between use of VAR 'check' and 'review' signal? CHECK: referee stops play by pointing finger to ear and extending other hand/arm to communicate with
VAR for Dummies: A Step-by-Step Explanation of Video Assistant Referees | 90min
Official Football Signals
VIDEO: Ever Wonder What Referees Are Really Signalling?
VAR in the Bundesliga: ′Completely fair football will never exist′ | Sports| German football and major international sports news | DW | 17.01.2019
Recognition of basketball referee signals from real-time videos | SpringerLink
23 Football Referee Signals With Images and What They Mean - HubPages
Guide to the Officials' Signals | NFL Football Operations
Players making VAR review 'TV signal' will be booked as system enters law book
Video assistant referee - Wikipedia
14 little-known NFL referee hand signals
