Gaya APA
Picazo-Tadeo, A, J., Reig-Martı´neza, E. (2004).
Directional distance functions and environmental regulation .
Spain:
Elseiver.
Gaya MLA
Picazo-Tadeo, Andre´s, J.., Reig-Martı´neza, Ernest.
"Directional distance functions and environmental regulation".
Spain:
Elseiver,
2004.
Article.