APA (7th ed.) Citation

Santos, J. F., Portela, M., & Pulido-Calvo, I. (2011). Regionalization of droughts in Portugal.

Chicago Style (17th ed.) Citation

Santos, João Filipe, M.M Portela, and I. Pulido-Calvo. Regionalization of Droughts in Portugal. 2011.

MLA (8th ed.) Citation

Santos, João Filipe, et al. Regionalization of Droughts in Portugal. 2011.