APA (7th ed.) Citation

Blatty, W. P., & Friedkin, W. (1998). The exorcist / [screenplay] William Peter Blatty. Faber.

Chicago Style (17th ed.) Citation

Blatty, William Peter, and William Friedkin. The Exorcist / [screenplay] William Peter Blatty. London: Faber, 1998.

MLA (9th ed.) Citation

Blatty, William Peter, and William Friedkin. The Exorcist / [screenplay] William Peter Blatty. Faber, 1998.

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