APA Style
Rifai, R. (2009).
Spatial Modeling and Element at Risk Assessment of Sidoarjo Mud Volcanic Flow .
Yogyakarta:
UGM.
MLA Style
Rifai, Rachman.
"Spatial Modeling and Element at Risk Assessment of Sidoarjo Mud Volcanic Flow".
Yogyakarta:
UGM,
2009.
Text.