The holy blood and the holy grail /
Michael Baigent, Richard Leigh and Henry Lincoln.

APA Citation

Baigent, M., Lincoln, H., Leigh, R. (2005). The holy blood and the holy grail. [New ed.]. London: Century.

MLA Citation

Baigent, Michael, Henry Lincoln, and Richard Leigh. The Holy Blood And the Holy Grail. [New ed.]. London: Century, 2005.

Warning: These citations may not always be complete (especially for serials).