Gaya APA

Stephens, C, D. (1993). Seismological Aspects of the 1989-1990 Eruptions at Redoubt Volcano, Alaska : The SSAM Perspective . ALASKA: Alaska Volcano Observatory.

Gaya MLA

Stephens, Christopher, D.. "Seismological Aspects of the 1989-1990 Eruptions at Redoubt Volcano, Alaska : The SSAM Perspective". ALASKA: Alaska Volcano Observatory, 1993. Text.