I. N. RAI, R. POERWANTO, L. K. DARUSMAN, and B. S. PURWOKO, “Changes of Gibberellin and Total Sugar Content in Flower Developmental Stages of Mangosteen”, HAYATI J Biosci, vol. 13, no. 3, p. 101, Dec. 2009, doi: 10.4308/hjb.13.3.101.