"How Volcanoes Work-Volcano Types". San Diego State University Department of Geologic Sciences. Archived from the original on 28 March 2019. https://web.archive.org/web/20190328045105/http://www.geology.sdsu.edu/how_volcanoes_work/Volcano_types.html ↩
Rosi, Mauro; Papale, Paolo; Lupi, Luca; Stoppato, Marco (2003). Volcanoes, a Firefly Guide. Firefly Books. ISBN 1-55297-683-1. 1-55297-683-1 ↩