Gaya APA
IAVCEI, . (1991).
Bulletin of Volcanology Volume 53 Number 7 September 1991 .
Heidelberg:
Springer International.
Gaya MLA
IAVCEI, .
"Bulletin of Volcanology Volume 53 Number 7 September 1991".
Heidelberg:
Springer International,
1991.
Text.