Gaya APA
Yokoyama, I. (1970).
Volcanological Survey of Indonesia Volcanoes Vol. 48 1970 .
Bandung:
Geology Survey of Indonesia.
Gaya MLA
Yokoyama, Izumi.
"Volcanological Survey of Indonesia Volcanoes Vol. 48 1970".
Bandung:
Geology Survey of Indonesia,
1970.
Text.