O'Connor, John J. and Robertson, Edmund F. (2000). The Indian SulbasutrasArquivado 07 de abril de 2016 en Wayback Machine., MacTutor History of Mathematics archive, St Andrews University
web.archive.org
O'Connor, John J. and Robertson, Edmund F. (2000). The Indian SulbasutrasArquivado 07 de abril de 2016 en Wayback Machine., MacTutor History of Mathematics archive, St Andrews University