Gaya APA

Korosec, M, A. (1980). The 1980 Eruption of Mount St. Helens (Juni 1980). Washington: Washington State Department of Natural Resources.

Gaya MLA

Korosec, Michael, A.. "The 1980 Eruption of Mount St. Helens". Juni 1980 Washington: Washington State Department of Natural Resources, 1980. Text.