APA (7th ed.) Citation

Gates, A. E. ., & Ritchie, D.. (2007). Encyclopedia of earthquakes and volcanoes [electronic resource] (3rd ed.). Facts on File.

Chicago Style (17th ed.) Citation

Gates, Alexander E. , and David Ritchie. Encyclopedia of Earthquakes and Volcanoes [electronic Resource]. 3rd ed. New York: Facts on File, 2007.

MLA (9th ed.) Citation

Gates, Alexander E. , and David Ritchie. Encyclopedia of Earthquakes and Volcanoes [electronic Resource]. 3rd ed. Facts on File, 2007.