APA-referens

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

Chicago-stil citat

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

MLA-referens

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

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