Gaya APA

Observations, Stratigraphy and Eruptive Processes of the 1990 Eruption of Kelud Volcano, Indonesia. (). New York, USA: Elsevier Science.

Gaya MLA

Observations, Stratigraphy and Eruptive Processes of the 1990 Eruption of Kelud Volcano, Indonesia. . New York, USA: Elsevier Science, . .