References for Lalla
- D Pingree, Biography in Dictionary of Scientific Biography (New York 1970-1990).
- G Ifrah, A universal history of numbers : From prehistory to the invention of the computer (London, 1998).
- B Chatterjee, A glimpse of Aryabhata's theory of rotation of earth, Indian J. History Sci. 9 (1) (1974), 51-55; 141
- R C Gupta, Aryabhata I's value of π, Math. Education 7 (1973), B17-B20.
- M Yano, Aryabhata's possible rebuttal to objections to his theory of the rotation of the Earth, Historia Sci. No. 19 (1980), 101-105.