BibTex format
@unpublished{Della:2008,
author = {Della, Corte P and Sarno, L and Tsiakas, I},
publisher = {Vox},
title = {Can we predict exchange rates? Economic evidence against the random walk model},
url = {http://voxeu.org/index.php?q=node/876},
year = {2008}
}