Gaya APA
Hadikusumo, D.
(1975).
Volcanic Activities in Indonesia during 1973
(
Mei 1975)
.
Bandung:
Direktorat Vulkanologi.
Gaya MLA
Hadikusumo, D..
"Volcanic Activities in Indonesia during 1973".
Mei 1975
Bandung:
Direktorat Vulkanologi,
1975.
Text.