Coningham, R.A.E.; Allchin, F.R.; Batt, C.M.; Lucy, D. (1996). "Passage to India? Anuradhapura and the Early Use of the Brahmi Script". Cambridge Archaeological Journal. 6 (1): 73–97. doi:10.1017/S0959774300001608.
jstor.org
Fulco, William J. (1978). "The Ammn Citadel Inscription: A New Collation". Bulletin of the American Schools of Oriental Research. 230: 39–43. JSTOR1356612.
nationsonline.org
Klaus Kästle (September 10, 2013). "Map of Southeast Asia Region". Nations Online Project. One World–Nations Online. Diakses tanggal September 10, 2013.
nhm.ac.uk
Homo erectus. London: Natural History Museum. Retrieved April 23, 2014.
pinyin.info
DeFrancis, John (1989). "Chinese". Visible Speech. The Diverse Oneness of Writing Systems. University of Hawaii Press. hlm. 89–121. ISBN978-0-8248-1207-2.