http://www.vedamu.org/Veda/1795 [2]$Vedic_Mathematics_Methods.pdf
http://arxiv.org/ftp/math/papers/0611/0611347.pdf [3]
http://vedic-maths-ebook.com/Memorymentor_Maths_tips.pdf [4]
http://cincinnatitemple.com/articles/VedicMathsTutorial.pdf [5]
Links
[1] https://www.hootsgo.org/?q=node/6548
[2] http://www.vedamu.org/Veda/1795
[3] http://arxiv.org/ftp/math/papers/0611/0611347.pdf
[4] http://vedic-maths-ebook.com/Memorymentor_Maths_tips.pdf
[5] http://cincinnatitemple.com/articles/VedicMathsTutorial.pdf