Gaya APA

Hadikusumo, D. (1971). National Report on Volcanic Activities and Volcanological Studies in Indonesia (Juni 1971). Yogyakarta: Direktorat Vulkanologi.

Gaya MLA

Hadikusumo, Djajadi. "National Report on Volcanic Activities and Volcanological Studies in Indonesia". Juni 1971 Yogyakarta: Direktorat Vulkanologi, 1971. Text.