Gaya APA

Journal of Volcanology and Geothermal Research Vol. 9 no. 4 March, 1981. (). Amsterdam: Elsevier Science Publishers B.V..

Gaya MLA

Journal of Volcanology and Geothermal Research Vol. 9 no. 4 March, 1981. . Amsterdam: Elsevier Science Publishers B.V., . .