APA citiranje

Barquero, R., Rojas, W., & Vargas, A. (2011). Summary of the seismic and volcanic activity in Costa Rica during 2011.

Citación estilo Chicago

Barquero, Rafael, Wilfredo Rojas, y Alberto Vargas. Summary of the Seismic and Volcanic Activity in Costa Rica During 2011. 2011.

MLA citiranje

Barquero, Rafael, Wilfredo Rojas, y Alberto Vargas. Summary of the Seismic and Volcanic Activity in Costa Rica During 2011. 2011.