, R., & , D. M. D. S. W. (2009). Spatial analysis of volcanic risk perception: : Case study in local community at Merapi volcano dangerous zones. [Yogyakarta] : Universitas Gadjah Mada.
Chicago Style Citation, RIANTO, and Dr. M.R. Djarot Sadharto Widyatmoko. Spatial Analysis of Volcanic Risk Perception: : Case Study in Local Community At Merapi Volcano Dangerous Zones. [Yogyakarta] : Universitas Gadjah Mada, 2009.
MLA引文, RIANTO, and Dr. M.R. Djarot Sadharto Widyatmoko. Spatial Analysis of Volcanic Risk Perception: : Case Study in Local Community At Merapi Volcano Dangerous Zones. [Yogyakarta] : Universitas Gadjah Mada, 2009.
警告：這些引文格式不一定是100％准確.