* Morton, J.F., 1987. Fruits of warm climates. Creative Resources Systems, Winterville, N.C. pp. 408-410.
* Sastrapradja, S., Sutisna, U., Panggabean, G., Mogea, J.P., Sukardjo, S. & Sunarto, A.T., 1980. Fruits. Projek Penelitian Potensi Sumber Daya Ekonomi - LIPI Publication Series No SDE-41. pp. 36-37.
== Sources of illustrations ==
Brown, W.H., 1954. Useful plants of the Philippines. Department of Agriculture and Natural Resources. Technical Bulletin 10. Manila Bureau of Printing (Reprint 1941 1943 edition). Vol. 3, p. 196, Fig. 73 a (flowering branch); Morton, J.F., 1987. Fruits of warm climates. Creative Resource Systems, Winterville, N.C., United States. Pl. 58 (colour photo; fruiting branch). Redrawn and adapted by P. Verheij Hayes.