Benitez-García, I., P. E. Vanegas-Espinoza, A. J. Melendez-Martínez, F. J. Heredia, O. Paredes-López, and A. A. Del Villar-Martínez. “Callus Culture Development of Two Varieties of Tagetes Erecta and Carotenoids Production”. Electronic Journal of Biotechnology, vol. 17, no. 3, May 2014, https://www.ejbiotechnology.info/index.php/ejbiotechnology/article/view/2014.01.004.