APA (7th ed.) Citation

Harris, J., De Bellaigue, G., & Millar, O. N. (1968). Buckingham Palace. Nelson.

Chicago Style (17th ed.) Citation

Harris, John, Geoffrey De Bellaigue, and Oliver Nicholas Millar. Buckingham Palace. London: Nelson, 1968.

MLA (9th ed.) Citation

Harris, John, et al. Buckingham Palace. Nelson, 1968.

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