Gaya APA
Journal of Volcanology and Geothermal Research Vol. 42 No. 1-2 July, 1990. ().
Amsterdam:
Elsevier Science Publishers B.V..
Gaya MLA
Journal of Volcanology and Geothermal Research Vol. 42 No. 1-2 July, 1990.
.
Amsterdam:
Elsevier Science Publishers B.V.,
.
.