link of numerical methods (books)

http://books.google.com.co/books?id=armfeHpJIwAC&printsec=frontcover&dq=numerical+methods&source=gbs_similarbooks_s&cad=1#v=onepag

http://books.google.com.co/books?id=y77n2ySMJHUC&printsec=frontcover&dq=numerical+methods&source=gbs_similarbooks_s&cad=1#v=onepage&q&f=false

http://books.google.com.co/books?id=czHV-1bEFl0C&printsec=frontcover&dq=numerical+methods&source=gbs_similarbooks_s&cad=1#v=onepage&q=numerical%20methods&f=false