Guavita-Vargas, Jacqueline, et al. “Carotenoids, chlorophylls and pectins during ripening of guava (Psidium guajava L.) from Santander, Colombia”. Revista Colombiana de Ciencias Hortícolas, vol. 12, no. 2, May 2018, pp. 379-8, doi:10.17584/rcch.2018v12i2.7713.