APA (7e ed.) Bronvermelding

Não informado. (2017). Earthquakes & Volcanoes. U.S. Geological Survey.

Chicago (17e ed.) Bronvermelding

Não informado. Earthquakes & Volcanoes. Reston, Va: U.S. Geological Survey, 2017.

MLA (8e ed.) Bronvermelding

Não informado. Earthquakes & Volcanoes. U.S. Geological Survey, 2017.

Let op: Deze citaties zijn niet altijd 100% accuraat.