Cita APA (7th ed.)

SpringerLink (Online service), Barcelo, D., & Petrovic, M. (2011). The Ebro river basin. Springer.

Cita Chicago (17th ed.)

SpringerLink (Online service), Damia Barcelo, i Mira Petrovic. The Ebro River Basin. Berlin, Heidelberg: Springer, 2011.

Cita MLA (9th ed.)

SpringerLink (Online service), et al. The Ebro River Basin. Springer, 2011.