Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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