1. Standard Methods for the Examination of Water and Wastewater,1975
2. Estudio Geológico a semidetalle de la zona geotérmica Volcán Tacaná, Chis. Informe 41/85;De la Cruz,1985
3. A C-14 Age Determination in the Tacaná Volcano Chiapas, México;Espindola;Geofis. Int.,1988
4. Boron;Harder,1969
5. Fluorine;Koritnig,1969