



 Edwards, E.L.,Jr. (ed.) (1990) Algebra for Everyone. National Council of Teachers of Mathematics: Reston, VA. [in HKUL] [in Learning Math]





 Mason, J. (1991) Routes to, Roots of Algebra. Milton Keynes: Open University. [in HKUL]





 The routes to / roots of algebra include: Expressing Generality Rearranging and Manipulating Possibilities and Constraints Generalized Arithmetic





 Algebra Applets in Wisweb, Freudenthal Institute






