L. Poppe, C Paull, C Newhall, J Bradbury et J Ziagos, « A geophysical and geological study of Laguna de Ayarza, a Guatemalan caldera lake », Journal of Volcanology and Geothermal Research, vol. 25, nos 1-2, , p. 125–144 (DOI10.1016/0377-0273(85)90008-3, Bibcode1985JVGR...25..125P)
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L. Poppe, C Paull, C Newhall, J Bradbury et J Ziagos, « A geophysical and geological study of Laguna de Ayarza, a Guatemalan caldera lake », Journal of Volcanology and Geothermal Research, vol. 25, nos 1-2, , p. 125–144 (DOI10.1016/0377-0273(85)90008-3, Bibcode1985JVGR...25..125P)