APA
United States Geological Survey, . (192006). Preliminary earthquake report: Magnitude 4.4 Galapagos Triple Junction. Denver, Colorado, USA: United States Geographical Survey, National Earthquake Information Center.
Chicago
United States Geological Survey, . 192006. Preliminary earthquake report: Magnitude 4.4 Galapagos Triple Junction. Denver, Colorado, USA: United States Geographical Survey, National Earthquake Information Center.
Harvard
United States Geological Survey, . (192006). Preliminary earthquake report: Magnitude 4.4 Galapagos Triple Junction. Denver, Colorado, USA: United States Geographical Survey, National Earthquake Information Center.
MLA
United States Geological Survey, . Preliminary earthquake report: Magnitude 4.4 Galapagos Triple Junction. Denver, Colorado, USA: United States Geographical Survey, National Earthquake Information Center. 192006.