Gaya APA
SImkin, T. (1983).
Krakatau 1883 : The Volcanic Eruption and Its Effect .
Washington DC:
Smithsonian Institution press.
Gaya MLA
SImkin, Tom.
"Krakatau 1883 : The Volcanic Eruption and Its Effect".
Washington DC:
Smithsonian Institution press,
1983.
Text.