L. A. M. SIREGAR, C. L. KENG, and B. P. LIM, “Effects of Medium Constituents on Growth and Canthinone Accumulation in Cell Suspension Cultures of Eurycoma longifolia Jack”, HAYATI J Biosci, vol. 16, no. 2, p. 69, Dec. 2009, doi: 10.4308/hjb.16.2.69.