APA (7th ed.) Citation

Baigent, M., Leigh, R., & Lincoln, H. (1989). Holy blood, Holy Grail. Corgi Books.

Chicago Style (17th ed.) Citation

Baigent, Michael, Richard Leigh, and Henry Lincoln. Holy Blood, Holy Grail. London: Corgi Books, 1989.

MLA (9th ed.) Citation

Baigent, Michael, et al. Holy Blood, Holy Grail. Corgi Books, 1989.