APA (7th ed.) Citation

Heiken, G., & Wohletz, K. (1985). Volcanic ash. University of California Press.

Chicago Style (17th ed.) Citation

Heiken, Grant, and Kenneth Wohletz. Volcanic Ash. Berkeley: University of California Press, 1985.

MLA (9th ed.) Citation

Heiken, Grant, and Kenneth Wohletz. Volcanic Ash. University of California Press, 1985.