Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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

Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.