Cita APA (7a ed.)

Tilling, R. I. (1982). Eruptions of Mount St. Helens: Past, present, and future. US Geological Survey.

Cita Chicago Style (17a ed.)

Tilling, Robert I. Eruptions of Mount St. Helens: Past, Present, and Future. Washington,D.C.: US Geological Survey, 1982.

Cita MLA (8a ed.)

Tilling, Robert I. Eruptions of Mount St. Helens: Past, Present, and Future. US Geological Survey, 1982.