1. ‘Introducing Algebra with a Texas Instruments TI92’;Brown,1998
2. ‘Mathematical Modelling and current events using hand held graphing technology’;Brown,1998
3. Jones P (1999) Personal Letter.
4. Kutzler B (1999, 17/6/99) The algebraic calculator as a pedagogical tool for teaching mathematics [World Wide Web]. Available: http://www.kutzler.com/bk/a-pt/ped-tool.html [1999, 17/6/99]
5. ‘Less may be more on a Screen’;Mason,1995