Gaya APA

Journal of Volcanology and Geothermal Research Vol. 41 No. 1-4 July, 1990. (). Amsterdam: Elsevier Science Publishers B.V..

Gaya MLA

Journal of Volcanology and Geothermal Research Vol. 41 No. 1-4 July, 1990. . Amsterdam: Elsevier Science Publishers B.V., . .