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Georgie Hermitage breaks world record to win T37 400m Paralympic gold | Paralympics 2016 | The Guardian
Women's 400m World Record is 48.25 – Žiga P. Škraba
Fastest since 1985, Naser wins women's world 400-meter
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Athletics-American Muhammad breaks own world record to win 400m hurdles | Nasdaq
Women's 400m World Record is 48.25 – Žiga P. Škraba
Mo Farah breaks two-mile world record at Birmingham Indoor Grand Prix | Mo Farah | The Guardian
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