2016 Olympics, track and field results: Allyson Felix wins 6th gold medal with 4x400 relay win

The men's and women's teams won gold in the 4x400, plus Matthew Centrowitz won the first gold for the US since 1908 in the 1500 meters.

I Feel At Peace': Felix Exits Stage With Record 11th Medal - Bloomberg

Olympics 2021: Olympic Results Today - Women's Running

U.S. Women Win 4x400m Relay, Allyson Felix Wins Ninth Olympic Medal - FloTrack

Allyson Felix Won Her 11th Olympic Medal With the 4x400 Relay Team - The New York Times

Olympics 2016: Allyson Felix and Team USA win gold medal in women's 4x400m run

Track and field in better place after 2016 Rio Olympics - Sports Illustrated

2016 Olympics, track and field results: Allyson Felix wins 6th gold medal with 4x400 relay win

Tokyo Day 14 Highlights: Allyson Felix Wins 10th Track Medal, Jamaican Women Win 4x100 Relay - The New York Times

Rio Olympics: Allyson Felix upset by Bahamas' Shaunae Miller in women's 400 meters – Orange County Register

Allyson Felix becomes most decorated female track and field Olympian in history

U.S. Track Team Caps Tokyo Olympics With Dominant Relay Wins - WSJ

Allyson Felix caps final World Championships appearance with 4×400 mixed relay bronze – Orange County Register

The Legacy of Allyson Felix: Motherhood, Olympic Champion and Legend - runblogrun