Gaya APA

Journal of Volcanology and Geothermal Research Vol. 39 No. 1 October, 1989. (). Amsterdam: Elsevier Science Publishers B.V..

Gaya MLA

Journal of Volcanology and Geothermal Research Vol. 39 No. 1 October, 1989. . Amsterdam: Elsevier Science Publishers B.V., . .