Gaya APA
Bulletin of the Global Volcanism Network Volume 15, No. 6, June 30, 1990. ().
Washington:
Smithsonian National Museum of Natural History.
Gaya MLA
Bulletin of the Global Volcanism Network Volume 15, No. 6, June 30, 1990.
.
Washington:
Smithsonian National Museum of Natural History,
.
.