APA (7th ed.) Citation

Campbell, C. L.. (1992). Diana in private: The princess nobody knows. Smith Gryphon.

Chicago Style (17th ed.) Citation

Campbell, Colin Lady. Diana in Private: The Princess Nobody Knows. London: Smith Gryphon, 1992.

MLA (9th ed.) Citation

Campbell, Colin Lady. Diana in Private: The Princess Nobody Knows. Smith Gryphon, 1992.