Gaya APA

Journal of Volcanology and Geothermal Research Vol. 40 No. 1 January. 1990. (). Amsterdam: Elsevier Science Publishers B.V..

Gaya MLA

Journal of Volcanology and Geothermal Research Vol. 40 No. 1 January. 1990. . Amsterdam: Elsevier Science Publishers B.V., . .