BibTex format
@unpublished{Della:2011,
author = {Della, Corte P and Sarno, L and Tsiakas, I},
publisher = {Vox},
title = {Carry on speculating on the volatility of foreign exchange},
url = {http://www.voxeu.org/index.php?q=node/6050},
year = {2011}
}