Gaya APA
Rifai, R., Kuswara, E. (2009).
Spatial modeling and element at risk assement of Sidoarjo mud volcanic flow .
Yogyakarta:
.
Gaya MLA
Rifai, Rachman., Kuswara, Edi.
"Spatial modeling and element at risk assement of Sidoarjo mud volcanic flow".
Yogyakarta:
,
2009.
Text.