real analysis books
realanalysis by h l royden https://www.google.co.in/url?sa=t&source=web&rct=j&url=http://math.harvard.edu/~ctm/home/text/books/royden-fitzpatrick/royden-fitzpatrick.pdf&ved=2ahUKEwjqgJ7novHYAhVEOI8KHR7hAMwQFjACegQIDxAB&usg=AOvVaw0lvBIqJI54yvtbrwm48r9Y