Dyfyniad APA

Alpízar, Y., Mora-Amador, R., González, G., Ramírez, C. J., Mora, M. M., & Taylor, W. (2014). Summary of the state of Costa Rican active volcanoes during 2012-2013.

Dyfyniad Arddull Chicago

Alpízar, Yemerith, Raúl Mora-Amador, Gino González, Carlos J. Ramírez, Mauricio M. Mora, y Waldo Taylor. Summary of the State of Costa Rican Active Volcanoes During 2012-2013. 2014.

Dyfyniad MLA

Alpízar, Yemerith, et al. Summary of the State of Costa Rican Active Volcanoes During 2012-2013. 2014.

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