Gaya APA

Keller, E, A., DeVecchio, D, E. (2019). Natural Hazards : Earth's Processes as Hazards, Disasters, and Catastrophes Fifth Edition (Fifth Edition). New York: Routledge.

Gaya MLA

Keller, Edward, A.., DeVecchio, Duane, E.. "Natural Hazards : Earth's Processes as Hazards, Disasters, and Catastrophes Fifth Edition". Fifth Edition New York: Routledge, 2019. Buku.