APA (7th ed.) Citation

White Peter D. (2007). How common is chronic fatigue syndrome; how long is a piece of string? BMC.

Chicago Style (17th ed.) Citation

White Peter D. How Common Is Chronic Fatigue Syndrome; How Long Is a Piece of String? BMC, 2007.

MLA (9th ed.) Citation

White Peter D. How Common Is Chronic Fatigue Syndrome; How Long Is a Piece of String? BMC, 2007.

Warning: These citations may not always be 100% accurate.