Gaya APA

Brantley, S, R. (). The Eruption of Redoubt Volcano, Alaska, December 14, 1989 Agust 31, 1990 . Washington: United States Government Printing Office.

Gaya MLA

Brantley, Steven, R. "The Eruption of Redoubt Volcano, Alaska, December 14, 1989 Agust 31, 1990". Washington: United States Government Printing Office, . Text.