Gaya APA

Sigurdsson, H. (1985). The Impact of Explosive Volcanic Eruptions on Human Populations: Tambora 1815 Eruption . : Pusat Vulkanologi dan Mitigasi Bencana Geologi, Badan Geologi.

Gaya MLA

Sigurdsson, Haraldur. "The Impact of Explosive Volcanic Eruptions on Human Populations: Tambora 1815 Eruption". : Pusat Vulkanologi dan Mitigasi Bencana Geologi, Badan Geologi, 1985. Text.