Links
[1] https://www.hootsgo.org/?q=node/6556
[2] https://bineeshthomas.wordpress.com/2012/04/13/sutra-5-shoonya-samyasamucayeif-the-totalcombination-is-same-it-should-be-zero/
[3] http://mathlearners.com/vedic-mathematics/multiplication-in-vedic-mathematics/urdhva-tiryak/
[4] http://www.ilovemaths.com/vedicmaths.asp
[5] http://w3facility.org/question/urdhva-tiryak-sutra-for-division/