“Genotoxicity Assessment of Water Samples from the Sungai Dua River in Pulau Pinang, Malaysia, Using the Allium Cepa Test”. Tropical Life Sciences Research, vol. 22, no. 2, Dec. 2011, pp. 23–35, https://ejournal.usm.my/tlsr/article/view/tlsr_vol22-no-2-2011_3.