Koyama, Renata, et al. “Application Time and Concentrations of Abscisic Acid on the Color Development of ’Isabel’ Grapes”. Semina: Ciências Agrárias, vol. 35, no. 4, Aug. 2014, pp. 1697-06, doi:10.5433/1679-0359.2014v35n4p1697.