Farmer, J. A., Harris, J., & Carson, R. (1980). Mt. St. Helens volcanic weatherbook. Mountain Graphics.
Cita Chicago Style (17a ed.)Farmer, Judith A., Julie Harris, y Richard Carson. Mt. St. Helens Volcanic Weatherbook. [Marylhurst, Or.]: Mountain Graphics, 1980.
Cita MLA (8a ed.)Farmer, Judith A., et al. Mt. St. Helens Volcanic Weatherbook. Mountain Graphics, 1980.
Precaución: Estas citas no son 100% exactas.