Numerical Methods :

1. Numerical Methods-by Jain ,Iyengar
2. Numerical Analysis: Mathematics of Scientific Computing -by-David Kincaid
3. An Introduction to Numerical Analysis -by-Suli E., Mayers D
4. Numerical Analysis MITOpenCourseWar Introduction to Numerical Analysis - 2012

Linear Algebra :

1. Linear Algebra and Its Applications-by-Gilbert Strang
2. Introduction to Linear Algebra -by-Gilbert Strang
3. Linear Algebra -by- P.Bhimasankaram
4. Linear Algebra MITOpenCourseWar Introduction to Linear Algebra

Complex Analysis :

1. Complex Variables and Applications -by-Brown-Churchill
2. Foundations of Complex Analysis-by-S.Ponnusamy
3. Complex Analysis MITOPenCourseWar Complex Variables