Παραπομπή APA

Gates, A. E., & Ritchie, D. (2010). Encyclopedia of Earthquakes and volcanoes, Viva Facts on file (3.).

Παραπομπή Chicago Style

Gates, Alexander E., και David Ritchie. Encyclopedia of Earthquakes and Volcanoes, Viva Facts on File. 3. New delhi, Viva Books, 2010.

Παραπομπή MLA

Gates, Alexander E., και David Ritchie. Encyclopedia of Earthquakes and Volcanoes, Viva Facts on File. 3. 2010.