1. American Geological Institute, 1957 —Glossary of Geology. NAS-NRC Pub. 501, p. 175.
2. ——, 1962 —Dictionary of Geological Terms. Dolphin Books, New York, p. 300.
3. Cotton, C. A., 1944 —Volcanoes as landscape forms. Whitcombe and Tombs, Christ-Church, 416 pp.
4. Daubeny, C., 1826 —A Description of Active and Extinct Volcanoes. Phillips, London, 466 pp.
5. Emmons, W. H., Allison, I. S., Stauffer, C. R., Thiel, G. A., 1960 —Geology (McGraw-Hill), New York, 491 pp.