Gaya APA

HENGEVELD, G. (1919). A View things on the Precursors of a Coming Outburst of the Kelud and others Volcanoes . Bandung, Jawa Barat, Indonesia: Pusat Vulkanologi dan Mitigasi Bencana Geologi.

Gaya MLA

HENGEVELD, G.J.N.. "A View things on the Precursors of a Coming Outburst of the Kelud and others Volcanoes". Bandung, Jawa Barat, Indonesia: Pusat Vulkanologi dan Mitigasi Bencana Geologi, 1919. Text.