My sources:

Trombley, R.B.. "WESTERN CARIBBEAN VOLCANIC ACTIVITY REPORT." Holocene Volcanic Activity. Principal Research Volcanologist. 29 Mar 2009 .

"Santa Maria and Santiaguito, Guatemala." oregonstate. 29 Mar 2009 .

John. "Santa María Volcano - John Search." Volcano Live. Adventure Travel. 29 Mar 2009 http://www.volcanolive.com/santamaria.html.



Book Source:

Travis, Cindie. "Climbing the Volcano Volcan Santa Maria.." DownTheRoad.org. DownTheRoad.org. 29 Mar 2009 .