Gaya APA

Hoblitt, R, P. (1980). Observasion of The Eruption of July 22 and Agust 7, 1980, at Mount St. Halens, Washington . Washington: Departement of The Interior.

Gaya MLA

Hoblitt, Richard, P. "Observasion of The Eruption of July 22 and Agust 7, 1980, at Mount St. Halens, Washington". Washington: Departement of The Interior, 1980. Text.