Gaya APA
McClelland, L., SImkin, T.
(1989).
Global Volcanism 1975 - 1985
.
New Jersey:
Prentice Hall.
Gaya MLA
McClelland, Lindsay., SImkin, Tom.
"Global Volcanism 1975 - 1985".
New Jersey:
Prentice Hall,
1989.
Text.