Gaya APA

Sundhoro, H. (1990). A Study of The Stratigraphy, Volcanology and Geochemistry of Pyroclastic Rocks from The Ijen . Wellington, N.Z.: Victoria University of Wellington.

Gaya MLA

Sundhoro, Herry. "A Study of The Stratigraphy, Volcanology and Geochemistry of Pyroclastic Rocks from The Ijen". Wellington, N.Z.: Victoria University of Wellington, 1990. Text.