Concise Mahavamsa (Only complete version of Mahavamsa in the web From King Vijaya to Sri Wikrama Rajasinghe in concise form), HTML Version, PDF version
Mahavamsa Pali and English together
Fathers of Mathematics
Hindu-Arabic Numerals by David Eugene Smith (Google Book)
How Sri lankan numbers went to India and then to rest of the world (Author: Florian Cajori, page 89, )
Sri Lankan Number System Closer to Modern System Than the Indian System
History of Sri Lanka (Turner, 1860)
History of Sri lanka (John Suckling, 1876)
