Gaya APA
Sudradjat, A. (1978).
Status of Volcanological Investigation in Indonesia (August 1978).
Bandung:
Direktorat Vulkanologi.
Gaya MLA
Sudradjat, A..
"Status of Volcanological Investigation in Indonesia".
August 1978
Bandung:
Direktorat Vulkanologi,
1978.
Text.