Gómez, D., Torres, R., Laverde, C., Cadena, O., Mier, R., Monsalve, M., . . . Calvache, M. (2009). A synthesis of the current state of the activity of Galeras volcano, Colombia, 2009. Universidad Pedagógica y Tecnológica de Colombia - UPTC.
Čikaški stil citiranja (17. izdanje)Gómez, Diego, Roberto Torres, Carlos Laverde, Oscar Cadena, Richard Mier, María Monsalve, Gloria Cortés, i Marta Calvache. A Synthesis of the Current State of the Activity of Galeras Volcano, Colombia, 2009. Universidad Pedagógica y Tecnológica de Colombia - UPTC, 2009.
MLA način citiranja (9. izdanje)Gómez, Diego, et al. A Synthesis of the Current State of the Activity of Galeras Volcano, Colombia, 2009. Universidad Pedagógica y Tecnológica de Colombia - UPTC, 2009.
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