APA (7th ed.) Citation

Tilling, R. I. (2009). El Chichón's "surprise" eruption in 1982: Lessons for reducing volcano risk. Universidad Nacional Autónoma de México.

Chicago Style (17th ed.) Citation

Tilling, R. I. El Chichón's "Surprise" Eruption in 1982: Lessons for Reducing Volcano Risk. Universidad Nacional Autónoma de México, 2009.

MLA (9th ed.) Citation

Tilling, R. I. El Chichón's "Surprise" Eruption in 1982: Lessons for Reducing Volcano Risk. Universidad Nacional Autónoma de México, 2009.

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