Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.