American Geosciences Institute. Georef: GeoRef Information Services. AGI.
Cita Chicago Style (17a ed.)American Geosciences Institute. Georef: GeoRef Information Services. New York, N.Y.: AGI.
Cita MLA (8a ed.)American Geosciences Institute. Georef: GeoRef Information Services. AGI.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.