Thomas Burrows, «Roger Federer's Formula for Final? Renting TWO Houses to Avoid Being Disturbed by His Young Family,» Daily Mail, July 11, 2015, .
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Alec Fenn, «How Gareth Bale and Real Madrid Sleep Their Way to the Top,» BBC Sport, April 21, 2015, .
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Jack Crone, «Manchester City Players Given Wallpaper with Special Sleep-Inducing Patterns in Their Bedrooms at Club's £200m Training Base,» Mail Online, January 3, 2015, .
