Vedic Mathematics or Sixteen Simple Mathematical Formulae from the Vedas by Bharti Krsna Tirthaji Maharaja (1981; Originally Published in 1965)
Also Review
Bhaskara I and His Works (Volume III) Laghu-Bhaskariya by Kripa Shankar Shukla
Aryabhatiya of Aryabhata Commentary by Bhaskara I and Somesvera Edited by Kripa Shankar Shukla
Bhaskara I and His Works (Volume II) Maha-Bhaskariya by Kripa Shankar Shukla (1960)