APA (7th ed.) Citation

Graysmith, R. (2002). Zodiac unmasked: The identity of America's most elusive serial killer revealed. Berkley Books.

Chicago Style (17th ed.) Citation

Graysmith, Robert. Zodiac Unmasked: The Identity of America's Most Elusive Serial Killer Revealed. New York: Berkley Books, 2002.

MLA (8th ed.) Citation

Graysmith, Robert. Zodiac Unmasked: The Identity of America's Most Elusive Serial Killer Revealed. Berkley Books, 2002.

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