Risk Takers: The NBA's 'bubble' saved the season from Covid-19. But another crisis was waiting inside
Electronic whistles a key way CEBL is adjusting to the COVID era
Seven officials have opted out of the 2020 NFL season – Football Zebras
NFL refs expected to wear masks, could use electronic whistles during 2020 season
NBC Sunday Night Football - Wikipedia
Game 13 Release Packet: Tennessee Titans vs. Jacksonville Jaguars - Sunday, Dec. 13, 2020 by Tennessee Titans - Issuu
2020-21 Eagle Football Fact Book (updated Feb. 18, 2021) by Eastern Washington University - Issuu
Meet the referees taking charge of World Cup 2022, Qatar World Cup 2022 News
What's that sound? It's an electronic whistle from sports officials because of COVID-19
The NFL and NFL Players Association agree to suspend all Covid-19 protocols
CFP National Championship Game Day Guide - College Football Playoff
Will sport embrace electronic whistles in a Covid-19 world?