, R., & , D. J. S. (2008). Spatial modeling and element at risk assessment of Sidoarjo Mud Volcanic Flow. [Yogyakarta] : Universitas Gadjah Mada.
Chicago Style Citation, RIFAI, and Dr. Junun Sartohadi. Spatial Modeling and Element At Risk Assessment of Sidoarjo Mud Volcanic Flow. [Yogyakarta] : Universitas Gadjah Mada, 2008.
MLA引文, RIFAI, and Dr. Junun Sartohadi. Spatial Modeling and Element At Risk Assessment of Sidoarjo Mud Volcanic Flow. [Yogyakarta] : Universitas Gadjah Mada, 2008.
警告：這些引文格式不一定是100％准確.