Gaya APA
Bulletin of The Global Volcanism Network Volume, 15, No. 10, October 31, 1990. ().
Washington:
Smithsonian Istitution.
Gaya MLA
Bulletin of The Global Volcanism Network Volume, 15, No. 10, October 31, 1990.
.
Washington:
Smithsonian Istitution,
.
.