Gaya APA

Keller, E, A., DeVecchio, D, E. (2016). Natural Hazards: Earth's Processes as Hazards, Disasters, and Catastrophes fourth edition (Fourth Edition). Oxon: Routledge.

Gaya MLA

Keller, Edward, A.., DeVecchio, Duane, E.. "Natural Hazards: Earth's Processes as Hazards, Disasters, and Catastrophes fourth edition". Fourth Edition Oxon: Routledge, 2016. Text.