Gaya APA

Sitorus, K. (1990). Volcanic Stratigraphy Geochemistry of The Idjen Caldera Complex,East Java Indonesia . New Zealand: Victoria University of Wellington.

Gaya MLA

Sitorus, Kastiman. "Volcanic Stratigraphy Geochemistry of The Idjen Caldera Complex,East Java Indonesia". New Zealand: Victoria University of Wellington, 1990. Text.