Prieto-Sandoval, Vanessa; Alfaro, José A.; Mejía-Villa, Andrés; Ormazabal, Marta (2016). "ECO-labels as a multidimensional research topic: Trends and opportunities". Journal of Cleaner Production. Cilt 135. ss. 806-818. doi:10.1016/j.jclepro.2016.06.167. hdl:10171/65275.
Prieto-Sandoval, Vanessa; Alfaro, José A.; Mejía-Villa, Andrés; Ormazabal, Marta (2016). "ECO-labels as a multidimensional research topic: Trends and opportunities". Journal of Cleaner Production. Cilt 135. ss. 806-818. doi:10.1016/j.jclepro.2016.06.167. hdl:10171/65275.