* ["Nonstandard Analysis" by Shulman], a gentle introduction * "Nonstandard Analysis" by Abraham Robinson, Princeton University Press 1996 |
* Shulman: Nonstandard Analysis, http://www.ugcs.caltech.edu/~shulman/math/nonstandard/nonstandard.html. A gentle introduction. * Abraham Robinson: Nonstandard Analysis, Princeton University Press 1996. The standard reference. |