APA (7th ed.) Citation

Wharfe, K. (2002). Diana: Closely guarded secret. Michael O'Mara Books Ltd..

Chicago Style (17th ed.) Citation

Wharfe, Ken. Diana: Closely Guarded Secret. London: Michael O'Mara Books Ltd., 2002.

MLA (9th ed.) Citation

Wharfe, Ken. Diana: Closely Guarded Secret. Michael O'Mara Books Ltd., 2002.

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