Defant, Mare J.; Clark, Lee F.; Stewart, Robert H.; Drummond, Mark S.; de Boer, Jelle Z.; Maury, René C.; Bellon, Hervé; Jackson, Thomas E.; Restrepo, Juan F. (1 January 1991). "Andesite and dacite genesis via contrasting processes: the geology and geochemistry of El Valle Volcano, Panama". Contributions to Mineralogy and Petrology. 106 (3): 309–324. Bibcode:1991CoMP..106..309D. doi:10.1007/bf00324560. S2CID130132647.
Defant, Mare J.; Clark, Lee F.; Stewart, Robert H.; Drummond, Mark S.; de Boer, Jelle Z.; Maury, René C.; Bellon, Hervé; Jackson, Thomas E.; Restrepo, Juan F. (1 January 1991). "Andesite and dacite genesis via contrasting processes: the geology and geochemistry of El Valle Volcano, Panama". Contributions to Mineralogy and Petrology. 106 (3): 309–324. Bibcode:1991CoMP..106..309D. doi:10.1007/bf00324560. S2CID130132647.
Defant, Mare J.; Clark, Lee F.; Stewart, Robert H.; Drummond, Mark S.; de Boer, Jelle Z.; Maury, René C.; Bellon, Hervé; Jackson, Thomas E.; Restrepo, Juan F. (1 January 1991). "Andesite and dacite genesis via contrasting processes: the geology and geochemistry of El Valle Volcano, Panama". Contributions to Mineralogy and Petrology. 106 (3): 309–324. Bibcode:1991CoMP..106..309D. doi:10.1007/bf00324560. S2CID130132647.