Travieso, L. L., A. P. Leon, V. R. Logegaray, D. Frezza, and A. Chiesa. “Loose Leaf Lettuce Quality Grown in Two Production Systems”. European Scientific Journal, ESJ, Vol. 12, no. 30, Oct. 2016, p. 55, doi:10.19044/esj.2016.v12n30p55.